Andrew Chadwich, chief executive of the RSI Association, replies: RSI isn't a condition, it's an umbrella term that says more about how you got the problem than what you are suffering from. RSI mainly affects the muscles, tendons and nerves of the neck, arms and shoulders. It's caused by repetitive movements of the muscles and awkward positions - people are often twisted when they're sitting at a computer and the blood doesn't flow properly. If tendons and muscles aren't kept lubricated with blood, they seize up. If you think it is RSI stop what you think is causing the problem. Get a diagnosis so you can identify the condition. To avoid RSI take regular breaks from your desk. When working at a computer, drop your hands down every few minutes and stretch your fingers and arms.