In the clinic, there are many causes of ankle joint effusion and pain, the more common ones are trauma to the ankle joint, inflammation of the ankle joint such as osteoarthritis and gouty arthritis, and also infections of the ankle joint. 1. Trauma: there is a clear history of ankle trauma, which is caused by fracture and cartilage damage, joint capsule damage, ligament damage, etc. In addition to ankle joint effusion, it is often accompanied by obvious pain. 2. Inflammation of ankle joint: common clinical cases include osteoarthritis of ankle joint, rheumatoid arthritis, gouty arthritis and traumatic arthritis, which are related to degenerative changes of ankle joint, autoimmune disorders, high uric acid, and traumatic injuries, which can lead to ankle joint effusion, swelling and pain. 3. Ankle joint infection: Bacterial infections in the ankle joint, such as osteomyelitis, etc., in addition to fluid accumulation and pain, there are redness, swelling and suppurative changes. It is recommended that patients go to the hospital in time to improve the auxiliary examination, in order to clarify the cause of the disease, and the professional physician to take appropriate treatment.