Baseball pitchers, musicians, and people who type all can suffer from RSI. The term RSI covers a broad range of injuries to tendons, nerves, and the circulatory system that result from long-term and repeated physical exertion.

Fatigue and pain in the wrist, forearm, elbow, or shoulder may mean strain. Rest usually improves the symptoms. Numbness or pain in the wrist at night, hours after stopping a repeated task, may mean the problem isn't work-related.

Physical therapy treats RSIs by improving strength, flexibility, and range of motion through targeted exercises, manual therapy, and the use of heat or ice. Biofeedback training involves a special electronic machine that teaches the person to become aware of, to follow, and to gain control over muscle tension and other bodily responses. Extracorporeal shock wave therapy treats RSIs, such as tendonitis, by using high-energy sound waves to stimulate healing, reduce pain, and improve blood circulation in the affected area. This helps promote tissue repair and reduce inflammation.

A good rule of thumb: Take short breaks after each half hour of typing. Stretch your fingers, form a fist, rotate your wrists, and gently shake out your hands. Maintain good posture by sitting up straight with your feet flat on the floor. Keep your shoulders relaxed, elbows close to your body, and wrists in a neutral, straight position. Consider using a split or curved keyboard that promotes a more natural hand position. An ergonomic mouse can also reduce strain.

Exercise improves muscle tone and reduces stress, both of which help prevent musculoskeletal problems.