Achilles tendonitis may be related to pulling on the Achilles tendon stop, degenerative changes, foot diseases, inappropriate shoes and arthritic diseases. 1. Pulling on the Achilles tendon stop: For people who play sports regularly or walk too much every day for a long time, the Achilles tendon stop will be pulled repeatedly for a long time, which will lead to chronic strain injury and aseptic Achilles tendon stop inflammation. 2. Degenerative changes: most of the Achilles tendonitis in the elderly is related to the degeneration of the body. In the elderly, the Achilles tendon gradually dehydrates, causing Achilles tendonitis. 3. Foot disease: When the foot is abnormal due to trauma or developmental reasons, for example, when the foot is turned in, there is an imbalance of force between the inner and outer sides of the Achilles tendon stopping point, and Achilles tendon stasis is easy to be formed. 4. Inappropriate shoes: If you wear crowded shoes or shoes with hard uppers for a long time, the Achilles tendon stopping point will be rubbed repeatedly, and Achilles tendonitis will be formed easily. 5. Arthritic diseases: Systemic diseases such as ankylosing spondylitis, rheumatoid arthritis, gouty arthritis, etc., which infringe on the Achilles tendon stopping point, will also cause Achilles tendonitis. If symptoms of Achilles tendonitis occur, it is recommended that the patient go to the hospital to clarify the cause of the disease and receive regular treatment.