Pain is an uncomfortable feeling and/or an unpleasant sensation in the body. The presence of pain often is an indication that something is wrong. Pain can appear suddenly or can come about slowly.

Each individual is the best judge of his or her own pain. Feelings of pain can range from mild and occasional to severe and constant. Pain can be classified as acute pain or chronic pain. Pain is classified as either acute or chronic. Acute pain can range from mild to severe and short-lived, and is often a signal that your body has been injured. Chronic pain can range from mild to severe, is present for long periods of time, and is often the result of a disease that may require ongoing treatment.