Tendonitis and carpal tunnel syndrome are not the same disease. The former is mainly due to a sterile exudative inflammation of the tendon caused by repeated friction in the tendon sheath, and is usually found near the joints, such as the root of the thumb or the metacarpophalangeal joints, and the symptoms are mainly popping and pain in the joints when moving. Carpal tunnel syndrome, on the other hand, is caused by a lesion of the tendons or tissues inside the carpal tunnel, resulting in a decrease in the size of the carpal tunnel and compression of the median nerve, resulting in numbness of the skin of the first three fingers as the main symptom. The pain is limited to the joint and is further aggravated by activity.