How cancer spreads

Cancer of the throat or larynx

From a top view of the voice box (larynx) and vocal cords, this animation shows the formation of a malignant tumor on the right vocal cord.

• Cancer

Mitral valve repair surgery

Watch this video to see how doctors do mitral valve repair surgery.

Knee extension with weight machine

The knee extension exercise targets the front of the thigh. See how it's done.

About Diabetes and Insulin

People with diabetes have too much glucose (sugar) in their blood. This occurs because of problems with a hormone called insulin.

Rheumatoid Arthritis

Rheumatoid arthritis is a long-term inflammatory condition that can affect the joints and other tissues and organs in the body.