A colonoscopy can be performed as a screening for colorectal cancer and other problems. The screening can help your doctor:

- Look for signs of cancers and other problems.

- Explore the cause of unexplained changes in bowel habits.

- Evaluate symptoms of abdominal pain or bleeding.

- Find a reason for unexplained weight loss, chronic constipation, or diarrhea.

The American College of Surgeons estimates that 90 percent of polyps or tumors can be detected through colonoscopy screenings.

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Most people have a problem with their stomach at one time or another. Indigestion and heartburn are common problems. You can relieve some stomach problems with over-the-counter medicines and lifestyle changes, such as avoiding fatty foods or eating more slowly. Other problems like peptic ulcers or GERD require medical attention.