After losing her husband, Jay Monahan, to colon cancer in 1998, Katie Couric became determined to share her newfound knowledge about this deadly disease. Her decision to become an advocate for colon cancer awareness and prevention seemed logical - over 6.3 million people watch the Today Show every day.

What should people know about colon cancer?

The most important thing for people to know about colon cancer, is that it has a 90 percent cure rate if detected in time. Women are affected just as often as men are. It is also important to know that no family history of the disease is no guarantee. Family history could start with you.

Colon cancer is cancer of the large intestine (colon), the lower part of your digestive system. Rectal cancer is cancer of the last 6 inches of the colon. Together, they're often referred to as colorectal cancers. About 112,000 people are diagnosed with colon cancer annually, and about 41,000 new cases of rectal cancer are diagnosed each year, according to the American Cancer Society.

What are the symptoms?

Many people with colon cancer experience no symptoms in the early stages of the disease. When symptoms appear, they'll likely vary, depending on the cancer's size and location in your large intestine.

Signs and symptoms of colon cancer include:

• A change in your bowel habits, including diarrhea or constipation or a change in the consistency of your stool for more than a couple of weeks
• Rectal bleeding or blood in your stool
• Persistent abdominal discomfort, such as cramps, gas or pain
• Abdominal pain with a bowel movement
• A feeling that your bowel doesn't empty completely
• Weakness or fatigue
• Unexplained weight loss

Blood in your stool may be a sign of cancer, but it can also indicate other conditions. Bright red blood you notice on bathroom tissue more commonly comes from hemorrhoids or minor tears (fissures) in your anus, for example. In addition, certain foods, such as beets or red licorice, can turn your stools red. Iron supplements and some anti-diarrheal medications may make stools black. Still, it's best to have any sign of blood or change in your stools checked promptly by your doctor because it can be a sign of something more serious.

When to consult a doctor

If you notice any symptoms of colon cancer, such as blood in your stool or a persistent change in bowel habits, see your doctor as soon as possible. Keep in mind that colorectal cancer can occur in younger as well as older people. If you're at high risk, don't wait until symptoms appear. See your doctor for regular screenings.

Talk to your doctor about when you should begin screening for colon cancer. Guidelines generally recommend colon cancer screenings begin at age 50. Your doctor may recommend more frequent or earlier screening if you have other risk factors, such as a family history of the disease.

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