Numbness in the fingertips of wrist tendonitis may be caused by nerve compression, and may also be combined with carpal tunnel syndrome, etc. 1. Nerve compression: wrist tendonitis is excessive hand activity caused by aseptic inflammation of the tendons and tissues around the tendons, commonly found in people engaged in hand labor, when the wrist is overused, it can lead to inflammation and edema and local narrowing, and after compression of the nerve, numbness of the fingers, pain and other symptoms will occur. 2. Carpal Tunnel Syndrome: It is related to strain injury and mostly occurs in people engaged in manual labor. It is a peripheral nerve compression syndrome caused by the compression of the median nerve in the carpal tunnel, which will cause pain in the wrist, numbness of the fingertips, weakness and other symptoms. Wrist tendonitis patients with numbness of the fingertips, should promptly consult a doctor for examination, to identify the cause of the disease to receive regular treatment, to pay attention to rest, avoid prolonged hand labor.