Repetitive strain injury (RSI) is a term that is used to refer to various kinds of injuries to muscles, tendons or nerves. These injuries are caused by repetitive movement of a particular part of the body. RSI can also be referred to as upper limb disorder (ULD). This is because the condition often involves the upper part of the body - the forearm, elbow, wrist, hands, and neck.

RSI is often caused, or aggravated, by frequently repeated movements, such as a task or leisure activity - for example playing golf or tennis regularly. Symptoms usually persist over time if left untreated.

As the number of people using computers increases, the chances of developing RSI increases. The repetitive action of typing on a computer can cause painful symptoms in fingers and hands. RSI caused by typing on a computer is typically referred to as 'writer's cramp'.

RSI is also linked to many types of repetitive manual work, such as the use of vibrating equipment in factories.

If there are any symptoms, including painful, tingling or swollen hands, elbows, wrists or shoulders, it is important to get treatment quickly. The sooner treatment is started the better the chances of recovery.