Tendonitis is inflammation of tendons which are the insertions of muscles into bones. It occurs when the tendons are subjected to repeated mechanical loads. If untreated, it can lead to chronic disability and tendon rupture. It can sometimes lead to carpal tunnel syndrome if it occurs at the wrist due to compression of a nerve in the wrist called Median nerve. If this occurs, there will be severe pain and tingling sensation. For both these conditions, the emergency treatment is rest to the joint and splinting. Then further management depends upon the extent of the condition.