Colon rectal cancer is a combination cancer of the large intestine (also called the colon) and the rectum. The rectum is the last section of the colon that is responsible for storing stool until it exits the body. Cancer of these organs is sometimes referred to as colorectal cancer. Risk factors for colon rectal cancer include polyps in the intestine, a high-fat diet and medical conditions such as ulcerative colitis or Crohn's disease, states Medline Plus. Individuals with colon cancer may not experience early symptoms of the disease.
Bleeding
Bleeding is often a sign of colon and rectal cancer. The bleeding may be in the stool or appear after having a bowel movement. Blood in stool may appear bright red or black. Black, tarry stools signify bleeding in the intestines. The intestine may bleed so slowly that the blood is not visible to the eye, but it is visible in a stool sample, under the microscope.
Change in Bowel Habits
Any changes in bowel habits need close monitoring. Episodes of constipation or diarrhea may be related to an illness or have a dietary relation. If this is the case, the symptoms will decrease and bowel habits will return to normal after several days. If the changes persist, medical attention is necessary. Additional bowel changes that need evaluation include a change in the size of the bowel movement. A narrower formed stool may warrant an evaluation. A feeling of needing to have a bowel movement, even after just having one, is an additional concern, according to Medline Plus, a publication of the National Institutes of Health.
Fatigue
Weakness and fatigue are common symptoms of colon rectal cancer, states the Mayo Clinic. Rest does not improve the feelings of tiredness. The fatigue stems from the bleeding into the intestine, according to the Merck Manual of Medical Information.
Weight Loss
Unintended weight loss may occur with colon and rectal cancer. The weight loss may occur from excessive amounts of diarrhea or from the inability of the colon to absorb nutrients.
Pain
Pain in the abdomen is a common symptom of colon rectal cancer. The pain can be sharp or a cramping sensation. General discomfort may be felt throughout the abdomen. This discomfort may feel like gas pains. The abdominal pain often accompanies constipation. Pain during a bowel movement is a symptom of rectal cancer.
