Repetitive Strain Injury, or Occupational Overuse Syndrome, is a general term that covers a variety of overuse injuries to muscles, tendons and nerves, predominantly of the forearm, wrists and fingers. RSI is an increasingly common condition that affects many people who, for instance, use machines that vibrate constantly, play a racket sport, use a keyboard or play a musical instrument. Such activities require repetitive movements of the fingers and wrists, often at speed, for hours on end.
Medical treatment for Repetitive Strain includes rest, anti-inflammatory medication, pain killers, steroid injections, physiotherapy and using a splint to immobilise the wrist.
To see how the Alexander Technique can help you with this condition, you may like to read my RSI article here.