Repetitive strain injuries (RSI) are a family of injuries affecting tendons, tendon sheaths, muscles, nerves and joints. They occur over time and cause persistent or recurring pains most commonly in the neck, shoulders, forearms, hands, wrists, elbows and lower limbs. Most common RSI include: Tendonitis, Golfer’s Elbow, Trigger Thumb, Carpel Tunnel, Thoracic Outlet Syndrome (TOS) and Writer’s Cramp. People who experience RSI experience symptoms such as: numbness, tingling, burning sensations, pain, dull ache, dry, shiny palm, clumsiness of the hands (loss of ability to grasp items, impaired thumb and finger dexterity), swelling around the wrist and hand, aches and pains which may be strongest at night.