The common causes of ankle pain are 1) ankle impingement syndrome, which is divided into:1. bony impingement, periarticular osteophytes, osteophytes of the anterior tibial lip and talar neck in the anterior aspect, and posterior ankle and deltoid prominence in the posterior aspect, and 2. soft-tissue inflammatory hyperplasia, anterior medial and anterior lateral pain. 2) Ankle instability: common is recurrent sprains, pain and swelling of the ankle joint due to injury or rupture of the anterior talofibular ligament, which of course can be combined with injuries of other ligaments. 3) Osteoarthritis: the treatment effect is poor 4) Intra-articular free body: the effect is good after removing it 5) Rheumatism, rheumatoid, strong chiropractic, joint infection in early stage, etc. It is good to apply ankle arthroscopy to diagnose and treat these diseases.