Anyone can get diarrhea. In fact, the typical American adult experiences diarrhea about four times a year. Most cases of diarrhea last a day or two and need no treatment. Find out more about this common digestive problem by taking this quiz.

The more active you are, the more calories you burn. Running or jogging, for instance, burns more calories than bowling.

Heart disease is the leading cause of death in men and women in the United States. Research has found that the risk of developing heart disease not only increases with the number of risk factors, but also with the level of severity of each risk factor. One of the ways you can help prevent heart disease is by knowing your risk factors. Learn more by participating in our Heart Disease Risk Factors Multimedia Interactive Program.

Cancer of the colon or rectum (colorectal cancer) usually develops slowly, over several years. Excluding skin cancers, colorectal cancer is the third most common cancer in both men and women in the United States and the second leading cause of cancer-related deaths, according to the American Cancer Society (ACS). Still, the death rate from colorectal cancer has been dropping for the last 15 years because of better detection and treatment. Take this simple assessment to learn about your risks for colorectal cancer.

Restless legs syndrome (RLS) is an unpleasant sensation that occurs while sitting or lying still, especially before or at bedtime. People with RLS describe a tingling, creepy-crawly, burning, or restless feeling in their legs. This video discusses possible causes of RLS and what you can do to minimize symptoms.

Younger men who have sleep apnea often also have erectile dysfunction. But researchers say that treating the sleep disorder has a side benefit: It may boost sexual performance.

Often called cardiac cath, this procedure can diagnose certain heart conditions and provide valuable information about your heart function. It may be performed to assess the coronary arteries, heart valves, and function of the heart muscle. A cardiac cath may also help determine the need for future heart surgery or other treatments.