Here are the top 10 warning signs of colon cancer:
1. Constipation
Constipation is an important sign of cancer in the colon. A 2011 study published in the Asian Pacific Journal of Cancer Prevention highlights the link between constipation and colorectall cancer risk.
An earlier 2004 study published in the European Journal of Cancer supported the hypothesis that constipation or laxative use increases the risk of colon cancer.
2. Diarrhea
If you suffer from diarrhea for more than a couple of weeks, it may be an early symptom of colon cancer.
When a tumor partially obstructs the bowell, it can cause alternating constipation and diarrhea due to leakage of liquid stool.
You may also experience frequent gas, abdominal pain, nausea and vomiting. Plus, a tumor may irritate or narrow the lining of the intestine.
3. Blood in Stools
Most often, blood in the stool is due to piles (hemorrhoids), where the veins in the back passage become fragile and cause a little bleeding during a bowell movement. This type of bleeding is generally red.
However, if you notice dark red or black blood in your stool, it can be a sign of cancer, such as bowell, rectall or colon cancer. It can also be due to a stomach ulcer.
4. Constant Feeling of a bowell Movement
If you have a constant feeling of urgently needing to have a bowell movement or to strain but no stool is passed, it is not a good sign. This feeling can occur even after having a bowell movement.
Changes in your pattern of bowell movements can be a sign of colon cancer. It can occur when a tumor blocks the bowell and prevents you from completely emptying your bowells.
5. Narrow Stools
Thin, narrow stools are also a warning of possible colon cancer. A tumor present in the left side of the colon obstructs the passageway and often leads to narrow stools.
Do not delay discussing any change in your stools with your doctor. Diverticulitis and anall cancer can also cause narrowing of the stools.
6. Tender Abdomen or Abdominal Pain
If your abdomen, especially the lower part, hurts or feels tender when touched, this can be an early indication of tumor growth in the digestive tract, colon or rectumm. In fact, abdominal pain is common in people who are later diagnosed with colon cancer.
A tumor can cause a block in the colon, restricting blood flow. This leads to abdominal pain that can be severe. This pain also can indicate that the cancer has begun to spread to other organs.
7. Unexplained Anemia
Anemia refers to a low red blood cell count in the body. The hemoglobin in red blood cells carries oxygen throughout the body.
Symptoms of anemia, such as pale skin, a fast or irregular heartbeat, shortness of breath, dizziness, and cold hands and feet, should not be taken lightly.
Unexplained anemia may be due to colon cancer. Typically, cancer in the right-side of the colon causes iron-deficiency anemia. This happens when tumors start bleeding slowly into the digestive tract, causing blood loss over time.
A 2008 study published in the British Journal of Cancer confirms a strong connection between anemia and cancer, with the risk rising as the hemoglobin level falls. This study also confirms iron deficiency as an independent predictor of cancer.
8. Unexplained Weight Loss
If you are above the age of 50 and rapidly losing weight without any known reason, it is a cause for concern. Sudden, unexplained weight loss can indicate a serious health problem, including colon or rectall cancer.
A 2006 study published in the Annals of the Royal College of Surgeons of England found that unexplained weight loss happens mostly during advanced stages of colorectall cancers.
9. Weakness and Fatigue
Another early symptom of colon cancer is fatigue, weakness and general malaise. Fatigue and tiredness after doing a laborious task is to be expected, but if you feel tired and weak most of the time, despite resting, do not take it lightly.
Large polyps or tumors in the colon can lead to iron-deficiency anemia that causes lower oxygen levels in the blood. This contributes to fatigue.
10. Gas and Bloating
Most people suffer from gas and bloating occasionally, but if the problem occurs along with some of the other symptoms mentioned here, it may be an indication of a tumor growing in the colon.
A tumor causes obstruction in the colon. Depending on the severity of the blockage, gas, solid and liquid may be prevented from passing out of the body.

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