Tendonitis refers to an inflammatory reaction caused by various factors such as over-fatigue, fiber tearing, or other injuries to the tendon and its surrounding tissues. Therefore, tendonitis usually has a cause, commonly seen in acute injuries or chronic strain. The main symptoms are: first, pain, which is often related to movement, intensifies during physical activity and alleviates during rest. Second, there is occasional slight swelling of the joint. Third, persistent pain occurs in bouts. This indicates that after the tendon recovers from an initial injury, persistent pain appears, which eases after rest or treatment but is prone to recurrence. Thus, tendonitis is an inflammation of the tendon and its surrounding tissues, usually a non-bacterial inflammation. If conservative treatment does not improve the condition after 7-10 days, it is recommended to seek medical treatment at a hospital.