Tendons are a type of tough connective tissue that connects muscles to bones. When tendons are subjected to repeated excessive stretching, excessive stimulation, or injury, it can lead to localized pathological changes, causing pain, swelling, and dysfunction at the affected site. This may also involve the tendon sheath that envelopes the tendon, leading to a series of aseptic inflammatory responses, thereby causing dysfunction and a range of symptoms in the affected area. Generally, after sufficient rest, avoiding intense activities, and the appropriate use of anti-inflammatory analgesic drugs, recovery can be achieved in about two weeks.