Carpal tunnel syndrome

Carpal tunnel syndrome occurs when the median nerve, which runs from the forearm into the palm of the hand, becomes pressed or squeezed at the wrist. The median nerve controls sensations to the palm side of the thumb and fingers (although not the little finger), as well as impulses to some small muscles in the hand that allow the fingers and thumb to move. The carpal tunnel - a narrow, rigid passageway of ligament and bones at the base of the hand - houses the median nerve and tendons. Sometimes, thickening from irritated tendons or other swelling narrows the tunnel and causes the median nerve to be compressed. The result may be pain, weakness, or numbness in the hand and wrist, radiating up the arm. Although painful sensations may indicate other conditions, carpal tunnel syndrome is the most common and widely known of the entrapment neuropathies in which the body's peripheral nerves are compressed or traumatized.    

Good Posture. Good posture is extremely important in preventing carpal tunnel syndrome, particularly for typists and computer users.

• The worker should sit with the spine against the back of the chair with the shoulders relaxed.
• The elbows should rest along the sides of the body, with wrists straight.
• The feet should be firmly on the floor or on a footrest.
• Typing materials should be at eye level so that the neck does not bend over the work.
• Keeping the neck flexible and head upright maintains circulation and nerve function to the arms and hands. One method for finding the correct head position is the "pigeon" movement. Keeping the chin level, glide the head slowly and gently forward and backward in small movements, avoiding neck discomfort.

Source: http://www.ninds.nih.gov , www.nytimes.com