When elbow canal syndrome arises, the following symptoms can be manifested in the early stage: a. After the elbow joint is compressed, it can manifest as uncomfortable sensation on the ulnar side of the forearm and the small finger, which can have no obvious numbness or painful symptoms, but can manifest as obvious uncomfortable sensation, which is difficult to locate and can be significantly relieved after proper rest. Second, when the elbow joint is compressed, it shows numbness in the ulnar side of the forearm and the small finger, and the numbness will gradually increase as the disease develops. However, in the early stage, since there is no excessive nerve damage, it does not lead to atrophy of the lesser interphalangeal muscle, but only to abnormal sensation on the ulnar side.