Repetitive Strain Injury (RSI) refers to a range of conditions caused by repetitive motions or overuse of muscles and tendons. Commonly affecting areas like the wrists, hands, and shoulders, RSI can result from activities such as typing, using a mouse, or playing musical instruments. Symptoms may include pain, stiffness, and swelling. Preventing RSI involves proper ergonomics, such as maintaining good posture and taking regular breaks during repetitive tasks. Stretching and strengthening exercises can also help reduce the risk. If symptoms persist, it is advisable to consult a healthcare professional for diagnosis and treatment options.