Health care

Colon Cancer Symptom

Colon cancer does not always present symptoms in its early stages. colon cancer symptoms usually do not appear until the disease has progressed to an advanced stage. This makes screening for colon cancer are very valuable – can detect colon cancer at an early stage, before symptoms begin to appear.

Signs and symptoms of colon cancer include:

* A change in bowel habits, including diarrhea or constipation or a change in the consistency of your stool for more than a few weeks

* Rectal bleeding or blood in your stool

* Persistent abdominal discomfort, such as cramps, gas or pain

* A feeling that your bowel does not empty completely

* Weakness or fatigue

* Weight loss that can not be explained

There is no single cause for colon cancer. Nearly all colon cancers begin as non-cancerous (benign) polyps, which slowly develop into cancer.

You have a higher risk for colon cancer if you:

* Are older than 60

]]>

* Are African American and eastern European descent

* Eat a diet high in red meat or processed

* What is cancer elsewhere in the body

* What is colorectal polyps

* What is inflammatory bowel disease (Crohn’s disease or ulcerative colitis)

* Have a family history of colon cancer

* Having a personal history of breast cancer

What you eat can play a role in colon cancer risk. Colon cancer may be associated with diet, high in fiber low in fat and red meat. However, some studies found that the risk does not drop if you switch to a diet high in fiber, so that the cause of the link is unclear.

Remember that some foods, such as beets, watermelon, and red licorice to make the stools turn red. To be on the safe side, always report any suspicious activity to the bench with your doctor.

What you eat can play a role in colon cancer risk. Colon cancer may be associated with diet, high in fiber low in fat and red meat. However, some studies found that the risk does not drop if you switch to a diet high in fiber, so that the cause of the link is unclear.

Your doctor will perform a physical exam and press on your stomach area. The physical exam rarely shows the problem, although doctors may feel a mass in the abdomen. A rectal exam may reveal a mass in patients with rectal cancer, but not colon cancer.

Find more at

Related Cancer Symptoms Articles

TAG CLOUG :

• at what stage of colon cancer do you bleed
• colon cancer early symptoms

Most of the times they do not appear or are hard to detect until the problem reach to an advanced stage.

Colon Cancer Tumor Pictures

However, it is always better to know about those which can be detected. Mentioned below are some known symptoms of colon cancer. In case if any of the mentioned symptoms is present for more than a week, do seek advice of your physician about the screening for colon cancer.

Change in Bowel Habits

Tumor in the bowel brings an observed change in the habits like defecating. With the growth of tumor, you may feel the need of defecating less often and the large size of tumor will lead to constipation.

The only way to know this is to get regular screening done instead of waiting for the symptoms to appear on the surface.

Thinned Stool

The presence of tumor causes obstruction and with the growth of obstruction there is reduction in the space around. In case the tumor is present at the side of the colon tube passage, it may result into the narrowing of the stool.

Cramping or Bloating in the Stomach

Another symptom in the list of colon cancer symptoms is bloating or cramping in the stomach. Boating may be due to a bowel obstruction while cramping may be the result of constipation or diarrhea. In the advanced stages of colon cancer, tumor perforating i.e. poking through near the wall of the bowel, can lead to extreme abdominal cramping.

Lung Cancer Secrets Revealed Click here

Blood in the Stool

There may be blood in the stool which is due to the bleeding of the tumor. Nevertheless, if the tumor is present in the right colon, it is very much possible that the blood will dry up before the faeces are removed from the body. But if it is towards the left or in the rectum, it may remain fresh and thus will appear bright red.

Inexplicable Weight Loss

If you are losing weight without making any deliberate efforts, it is really something to ponder over. Often one has weight loss due to the fact that something wrong is going in the body. However, in colorectal cancer, unexplained loss in weight is one of the colon cancer symptoms and it indicates that the bowel is being blocked at some place, along the passage, by a tumor.

Exhaustion and Feelings of Fatigue

You are having proper sleep but still feel exhausted. There may be more than one reason and work load may not be the obvious one. The first possibility is that it may be due to anemia which takes place if the red blood cells are not able to carry sufficient oxygen as much they are required to. Consequently, you might feel exhausted. But it may also be due to tumors. Tumors can also be the cause of anemia.

Feel Like to Defecate but Not

You may feel like to go for defecation but you do not. This kind of sensation in the body may take place due to a tumor growing in the end of the colon or rectum.

The best option is to have screening for colon cancer on regular basis instead of depending on appearance of colon cancer symptoms.

lung cancer treatment breakthroughs Click here

There have been several individuals in my own family who have succumbed to this deadly form of cancer. Colon Cancer Statistics By Age I know there is a great chance of you knowing someone or even you having this type of cancer. As a result, colon cancer is the third most diagnosed cancer in women and men in the United States. Moreover, only around 39% of colon cancer cases are detected early. Currently, it is the second leading cause of cancer related deaths in the United States.

What Is Colon Cancer?

The rectum and colon are both part of the large intestine. Colon cancer actually originates in the large intestines. Sometimes it is called colorectal cancer, and it refers to cancer the affects the rectum and or colon.

What Causes Colon Cancer?

Before I get into what are colon cancer symptoms, lets discuss the risk factors for this deadly disease. Research hasn’t identified without mistake what causes colon cancer, but have pinpointed several risk factors. Here are several of the risk factors: age, diet, genetics, alcohol and other factors. I have more information on colon cancer and other disease located at the website located in the resource box below.

What Are Colon Cancer Symptoms?

The truth is that sometimes colon cancer doesn’t present any symptoms. Unfortunately for some people the first symptom of colon cancer doesn’t reveal itself until the disease has progressed into an advanced stage. Here are some colon cancer symptoms:

Lung Cancer Secrets Revealed Click here

Bleeding blood in the stool. This is the most commonly experienced form of cancer symptom.

Weight Loss. The pain from the tumor can cause a loss of appetite.

Abdominal Pain. Swelling and pain of the abdomen occurs when the intestine is blocked by a tumor.

Changes in Bowel Habits. If you suffer from constant diarrhea, constipation, gas, bloating and/ or producing thinner stools then this might be an indication of colon cancer.

I have more detailed information on colon cancer, liver cancer, cervical cancer, and bone cancer among others located at the website in the resource box below.

DISCLAIMER

The information provided herein should not be construed as a health-care diagnosis, treatment regimen or any other prescribed health-care advice or instruction. The information is provided with the understanding that the publisher is not engaged in the practice of medicine or any other health-care profession and does not enter into a health-care practioner/ patient relationship with its readers. The publisher does not advise or recommend to its readers treatment or action with regard to matters relating to their health or well being other than to suggest that readers consult appropriate health-care professionals in such matters. No action should be taken based solely on the content of this publication.

The information and opinions provided herein are believed to be accurate and sound at the time of this publication based on the best judgment available to the authors. However, readers who rely on information in this publication to replace the advice of health-care professionals, or who fail to consult with health-care professionals assume all risks of such conduct. The publisher isn’t responsible for errors or omissions. The Food and Drug Administration have not evaluated these statements. These products aren’t intended to diagnose, treat, cure, or prevent any disease.

lung cancer treatment breakthroughs Click here

It is responsible for over 16,000 deaths in the UK each year and is therefore one of the most dangerous types of cancer around. Colon Cancer Screening Guidelines Family History There are a number of symptoms which could indicate that you have bowel cancer. In this article I will be discussing these signs and symptoms and hopefully give you the information to identify this disease sooner rather than later.

Unlike other conditions where the symptoms are often clear and easy to identify, colon cancer symptoms are usually vague and more difficult to spot. As the cancer becomes more advanced and the tumour grows, the symptoms become more noticeable. However, by this time it is often more difficult to treat the cancer effectively. That is why it is essential for you to be on the lookout for signs of bowel cancer at all times. By doing this you can significantly improve your chances of identifying colorectal cancer early and getting it treated. There are many symptoms associated with this type of cancer but below I have outlined four of the most common.

1) BLOOD IN THE STOOLS OR RECTAL BLEEDING:- This is probably the number one symptom of colon cancer. With this type of cancer the tumour develops in the final section of the digestive tract. Therefore, if the tumour bleeds some of this blood usually comes out of the rectum or in your stools. The bleeding is not usually significant but if you notice any at all then you should inform your doctor immediately.

Lung Cancer Secrets Revealed Click here

2) PAIN IN THE STOMACH:- If the tumour gets large enough it can cause a blockage in your colon. This blockage can prevent solids, fluids or gases passing through your bowel which then leads to cramps and pains. In the worst cases, the tumour can grow so large that it breaks through your bowel wall which again causes major stomach pains. Although stomach pains are associated with multiple conditions, any prolonged pains could be indicative of colon cancer. If you experience these pains for an extended period go and see your doctor right away.

3) DIFFERENT BOWEL MOVEMENTS:- If the tumour becomes large it can also have an impact on your bowel movements. The blockage created by a large tumour can prevent stools from passing through the colon leading to constipation (difficulty passing stools). It can also cause a build up of fluid behind the tumour which eventually leaks through leading to diarrhea (difficulty controlling your bowel movements because your stools have become watery). If you notice any unusual bowel movements, particularly for long periods, this could be a sign of colorectal cancer and you should consult your doctor.

4) UNEXPECTED WEIGHT LOSS:- Sometimes tumours release chemicals which increase your metabolism and cause you to burn more calories than usual. Therefore, if you experience any unexpected or unexplained weight loss you should consult your doctor and get yourself tested for bowel cancer. Even if the weight loss is not linked to cancer it is still advisable to see your doctor because any weight loss that you cannot account for is likely to have some underlying cause.

As you can see from this article the symptoms of colon cancer are not always obvious and easy to identify. However, I hope this article has shown you some of the things you should be looking out for. Bowel cancer is much more treatable if it is caught in the early stages so if you notice any of the above symptoms do not take any chances. Go see your doctor right away and get a professional verdict.

Whilst every intention has been made to make this article accurate and informative, it is intended for general information only. Colon cancer is a very serious, life threatening condition and you should discuss any concerns, treatments or lifestyle changes fully with your doctor.

lung cancer treatment breakthroughs Click here

TAG CLOUG :

• how can you tell if you have cancer in your bowels

The lower part of your digestive system is called the large intestine or the colon. When cancer occurs in this part of the digestive system it is called colon cancer. The last several inches of the colon is referred to as the rectum and when cancer occurs in this part, it is referred to as rectal cancer. Both these cancers are usually referred together as colorectal cancer. Let’s have a look at the causes and risk factors of colorectal cancer before going onto the symptoms and treatment.

Causes and risk factors of colorectal cancer

The exact causes of colon cancer are not known. However, there are certain factors that increase your risk of developing this disease. Following are some of the factors that increase your risk of getting colorectal cancer:

Most colon cancers begin as polyps on the inside lining of the colon. These are precancerous growths in the colon common after the age of 50. If not removed, they can become cancerous.
Colon cancer is more likely in people above the age of fifty.
A family history of this cancer increases your risk of getting this disease.
There are certain inherited gene mutations that increase the risk of colon cancer and these are passed through families.
Conditions such as ulcerative colitis and Crohn’s disease that cause inflammation of the colon increase the risk of cancer.
People consuming a high-fat diet which is low in calcium, folate, and fiber are at an increased risk of getting this disease.
Smoking increases the risk of developing polyps and colorectal cancer.
Symptoms of colon cancer

Many people with colon cancer may not experience any symptoms in early stages of the disease. However, following symptoms may be experienced once the cancer advances:

Change in bowel habits, such as diarrhea or constipation
Feeling that you have not been able to empty your bowel completely
Bleeding from the rectum or blood in stool
Stools that are narrower than usual
Weight loss without any obvious reasons
Cramps, pains, or gas
Feeling bloated or full
Constant fatigue
Nausea or vomiting
Diagnosis and treatment of colon cancer

If your doctor suspects colon cancer, he/she may conduct some tests for the diagnosis of the disease. These include blood tests, colonoscopy (which uses a long tube with a camera) to examine the inside of your colon, a barium enema to evaluate your colon with an X-ray, and a CT scan. Certain tests and procedures may also be used to see the stage of the cancer.

Treatment usually depends on the stage of colon cancer. If the cancer is at an early stage and confined to a small part of the colon, it can be removed during a colonoscopy. A colectomy may be required to remove the part of colon that has the cancer. During an advanced stage of the cancer, a surgery may be done to remove certain blockages in the colon for relief in the symptoms. Chemotherapy, radiation therapy, and targeted drug therapy are also treatment options for this cancer.

Regular screening for cancer, eating a healthy diet, and maintaining a healthy weight are the best ways to prevent colon cancer. However, if you do experience any of the above symptoms, make sure to consult your doctor immediately.

 

 

 

There are several types of cancer and they are divided into different categories according to their symptoms and causes. Metastatic Colon Cancer Treatment Among several cancers, Colon cancer is also the one getting common now-a-days. Colon cancer is caused due to the growing of cancerous cell in the tissues of the colon. There are several Colon cancer symptoms but they can not be considered as the early sign of this disease. There are several tests which can easily make you understand whether the colon cancer in infected or not and these tests includes the fecal occult blood tests (FOBT) and colonoscopies. The main symptoms on the basis of which one can go for the above mention tests are as follows:

1. Constipation
It is the condition when the person is facing difficulties for passing the stool. In the early stage the waste material in the colon becomes very mushy and this mushy waste can easily get accumulated around anything that gets in its way. But as the time get near to the end of the colon these accumulated waste material solidifies and creates problems for passing it out. There are possibilities of tumor in the rectum’s far end and due to this reason the person can face difficulties in moving the fecal things through it. Therefore Constipation can also be a symptom out of several other colon cancer symptoms.

Lung Cancer Secrets Revealed Click here

2. Thin stool
The thin stool from the body can easily indicate that some obstacles are there which don’t allow the proper passing of the waste material from the body. If the stool can’t remain in the mushy form and comes out through the colon region, the stool’s shape can provide you information about the problem inside your body. The obstacle which stops the waste material in the body can be a tumor. So, the thin stool coming out from the body is considered as the second symptom among several other colon cancer symptoms.

3. Stomach cramps
Sometimes there becomes blockage in your stomach due to the tumor which causes problem in passing, solids, liquids, and even gas due to the blockage strictness. Finally it results in abdominal cramps that can be severe and the blockage can also stop the flow of blood to the colon. If there are Painful cramps occurring in your stomach it may also indicate that a tumor has perforate and it is a medical emergency. Thus this is also one of the colon cancer symptoms found now-a-days.

There are several other colon cancer symptoms and all these symptoms will provide you the information about the possibilities of a tumor inside the colon or the stomach but these symptoms are not accurate to judge that the person is suffering from the colon cancer. For knowing that the person is infected by the colon cancer, he/she should test himself/herself with the above mentioned tests.

lung cancer treatment breakthroughs Click here

Colon cancer is one of the preventable cancers and its symptoms are not easily identifiable. The colon cancer, when diagnosed, is usually at the advanced stage. It is also necessary to be informed about the symptoms of colon cancer as it would help you to take care of your health.

There are many symptoms of colon cancer and these symptoms cannot be identified in the early stages of colon cancer. Hence, it is highly recommended to opt for regular health checkups once an individual attains the age of fifty.

The symptoms of colon cancer are classified into two types. They are Local and Systemic symptoms.

The local colon cancer symptoms are diarrhea, constipation, changes in bowel movement and frequent gas pains or cramps. The systemic colon cancer symptoms are jaundice, anemia, unexplained fatigue, loss of appetite nausea, vomiting and jaundice.

It is necessary to consult a doctor if you experience any of these symptoms mentioned above. This will help you to do the necessary tests and also prepare yourself before doing these tests.

The different stages of colon cancer are described here:

The first stage is the stage 0 i.e. is the earliest stage of colon cancer. This stage can be described as the findings of a group of abnormal cells in an individual’s colon. This stage is just the beginning of cancer and is not dangerous to the individual’s life.

The next stage is the stage I when the cancer has spread outwards beyond the inner tissue layer that exists on the wall of the individual’s colon.

The stage II of colon cancer is divided into Stage IIA and Stage IIB. In stage II A colon cancer, is the cancer spreads to the middle layers of the tissue in the walls of the colon and the surrounding tissues. Stage IIB occurs when the colon cancer has spread into the organs in the region or into the abdominal wall.

In stage III, the cancer spreads to the other organs of the body and requires aggressive treatment such as chemotherapy, surgical resection and other medical therapies.

In the stage IV, this cancer spreads to other organs such as liver or lungs.

Colon cancer chemotherapy is recommended for treating the stage III and stage IV of colon cancer along with the biologic therapies. It is sometimes also recommended for the stage II colon cancer.

 

Free Colon Cancer Screening Kits

He disregarded the potential testicular cancer symptoms and attributed the pain to too much exercise. The cancerous growth spread to other parts of his body before the doctors diagnosed it. He was undergoing radiotherapy and chemotherapy. Don’t be ignorant to the Cancer Signs, look at the symptoms for testicular cancer and go and see a doctor immediately!

Here are some of the symptoms which you have to look out for, to make sure that you do not stand in Lance Armstrong’s shoes.

Free Colon Cancer Screening Kits

 

Are you feeling extremely tired and have a low sex drive, when once you are extremely energetic and had a good sex life?
Do you find this feeling of discomfort and a mild pain in your testicles, groin region lower area of the stomach and in your legs?
Have you suddenly notice that your testicles are changing their shape? Has a testicle hardened in the past couple of months?
Lung Cancer Secrets Revealed Click here
Have you seen some swelling in the testicles, especially when one looks as if it has shrunk and the other looks as if it has swollen up to more than thrice the normal size?
Have you found some sort of lumpy tissue or growth, whenever you press the testicles gently?
Are you finding blood in the semen?
Are you suffering from hydroceles in the scrotal sac?

 

Any or all of the symptoms taken together are definitely potential testicular cancer symptoms and as Prevention is better than cure, it is necessary that you go to your doctor right now.

Many cases of cancer have become potentially fatal, just because the patient disregarded the symptoms. The idea of “this cannot happen to me, I am healthy,” is not something which is a very healthy outlook, either physical or mental. So, it is much better to err on the safer side, than to disregard, what can potentially be fatal if it spreads to other parts of the body. You might be rather shy, going to the doctor and telling him your symptoms; this is going to be the case, if you are just 16 and imagine that he is going to laugh at you. That is definitely not true. He is going to diagnose your symptoms, look at the extent to which the disease has spread, and then give you the best treatment to make sure that you live long and prosper.

Some of the questions you might want to ask your doctor if you are diagnosed with testicular cancer, are -

 

Is this type of cancer fatal?
Can I be cured by radiotherapy and chemotherapy
Am I in the poor risk potentially fatal group or in the good risk shall be cured group?
Will it be necessary for me to use the help of sperm banks in the future?
What are the side effects of chemotherapy if needed, going to be?

 

The doctor is definitely going to reassure you on all these points. So do not wait, if you see any of the testicle cancer symptoms. See your doctor now!

Companies such as Macy’s and Target are inviting their consumers to join them in the fight against breast cancer. The “Pink Ribbon Items” are sold to help support breast cancer research. These companies have agreed to donate a portion of the proceeds to breast cancer charities. Most items related to breast cancer awareness can be identified with a pink label or a pink ribbon. Ford Motor Company has supported breast cancer research for over 10 years by donating money and selling pink silk scarves specifically for breast cancer charities. All businesses are invited to invest in unique corporate gifts that help support breast cancer research. There are corporate gifts available that are embellished with the breast cancer awareness “pink ribbon”. Some of the other gifts are manufactured in pink and can be personalized with a monogram. These breast cancer awareness business gifts [http://www.corporatesnobs.com/professional-in-pink.htm] range any where from heart-shaped luggage tags to pink leather totes.

Breast cancer awareness is not limited to woman only. Men are encouraged to support the cause as well. According to the National Breast Cancer Foundation, 1600 men will be diagnosed with breast cancer this year. Even the most masculine man should rethink wearing pink when it comes to supporting a great cause.

Although, October is designated as National Breast Cancer Awareness Month, supporting the cause can be a year-round commitment. Those who are unaffected by breast cancer should help join the fight against breast cancer for their loved ones. Whether you decide to participate in an American Cancer Society sponsored walk, donate money to breast cancer charities, or invest in business gifts that help support breast cancer

lung cancer treatment breakthroughs Click here

More than 95% of colorectal cancers come from adenocarcinoma polyps. These cancers start in cells that form mucus glands, which lubricate the colon and rectum. A polyp is a group of cells that form on top of each other and may eventually turn cancerous. Carcinoid tumors, gastrointestinal stromal tumors and lymphomas also cause 5% of colon cancers. Doctors say the best way to prevent colon cancer is to undergo regular screening tests after the age of 50 and maintain a healthy lifestyle.

Before talking about colon cancer prevention, let’s talk a little about what colon cancer is, exactly. Both the colon and rectum are part of the digestive system. The first part of the digestive system, which is the esophagus and stomach, breaks down food to be processed into energy. Next, the broken down food travels to the small intestine/bowel, which is a narrow, 20-foot section that continues breaking down food and absorbing most of the nutrients. The small intestine then sends the remaining material to the five-foot-long colon (which is also referred to as “the large intestine”), where it absorbs salt and water and stores waste. The first part of the colon is the ascending colon, which is attached to the small intestine and the appendix on the right side of the abdomen. The transverse colon runs from the right to the left side of the upper abdomen. The descending colon travels downward on the left side and the sigmoid colon is an S-shaped portion that passes food matter down to the rectum, the final six inches of the digestive system, which will pass food out of the body through the anus. No one is really sure what exactly causes a colon cancer cell to develop in the first place, or why some experience a colon cancer recurrence, but research suggests a variety of lifestyle, hereditary and environmental factors are at play.

It may be impossible to completely prevent Colon cancer, but the American Cancer Society says that catching colon cancer symptoms early through screening tests is the key. Regular colon cancer screening should begin at age 50 for most people, unless they’re in a high risk category. Each year, individuals should get a fecal occult blood test, which is done by submitting a stool sample. A stool DNA test may also be done at that same time, since it also uses a stool sample to gather results. Then, every five years, patients should get a flexible sigmoidoscopy, which involves a long, flexible tube that checks the last few feet of the colon for colon polyps, and a double-contrast barium enema that uses an x-ray and dye to check the upper portion of the colon. A virtual colonoscopy using a CT scan machine should also be done every 5 years. Testing options include stool sample testing (fecal occult blood test, stool DNA test), lighted exploratory tubes being placed in the colon to look for polyps (flexible sigmoidoscopy, colonoscopy), and x-rays (double-contrast barium enema, virtual colonoscopy). These should be done every 5 to 10 years, on average.

Lastly, lifestyle changes are an important way to prevent colon cancer. It goes without saying that smoking, inactivity and excessive alcohol consumption are contributors to many types of adverse health conditions. Colon cancer prevention involves eating the right foods, including cabbage, Brussels sprouts, carrots, beets, onions, potatoes, broccoli, artichokes, celery, beans, peas, whole grain products, berries, cantaloupes, mangoes, persimmons and dried apricots, etc. In addition to these foods, individuals should limit red meat, saturated fat, alcohol and tobacco consumption.

There are several choices for colon cancer screening that one can choose from. Flexible sigmoidoscopy, FOBT, a combination between those two, colonoscopy or barium enema are the screening options for colon cancer. As you can imagine, all these options have their advantages and disadvantages. These can differ from a colon patient to another. There are some factors that have to be taken into consideration when a colon cancer patient chooses one of these strategies:

- the preference of the colon cancer patient;

- medical contraindications;

- adherence;

- the resources that are available for testing;

The clinic where the patient goes to do the screening for colon cancer should also talk to people about benefits and also about the risk that the colon cancer patient must face in each of these options that are available to him.

The screening intervals depend from a test to another. For example, if you choose the FOBT test for colon cancer, an annual screening is recommended. It is proved to reduce the rate of mortality. However, this colon cancer screening type unfortunately gives a lot of false- positive results. If colonoscopy is your choice, then this colon cancer screening must be done once in ten years. A shorter period of time, about five years, is recommended in barium enema. The reason is that this colon cancer screening option is thought to have a lower sensitivity. However, besides FOBT, all the other colon cancer tests can be done in shorter intervals as well, because studies have revealed that some of these tests can be effective even when done in those shorter intervals.

The age that both men and women should start screening for colon cancer is 50 years, because there is a great incidence of colon cancer above this age. However, if one of your family members is diagnosed with colon cancer, then it would be best for you to start screening even if you have not yet reached 50. There is no certain age when screening for colon cancer must be discontinued. However, in general, screening for colon cancer has been restricted to people that are older than 80 years.

The cost of these colon cancer screening tests also varies from a test to another. Colonoscopy is generally thought to be the most expensive of all these tests, but also the most sensitive. Furthermore, if colonoscopy is your choice, then you should know that this colon cancer screening tests also requires highly trained doctors besides the cost.

For more resource on different colon cancer subjects please click this link http://www.colon-cancer-center.com. You can also find valuable information about colon cancer or even about colon cancer symptoms