The causes of ankle pain after sitting down and getting up include ankle impingement syndrome and ankle tendon injury. 1. Anterior and lateral ankle impingement syndrome: including bony impingement (due to ankle joint degeneration combined with anterior and lateral margins of the talonavicular joints), soft tissue impingement (the most common cause is impingement caused by rupture of the joint capsule and lateral ankle ligaments after ankle joint inversion injury). Clinical manifestations are chronic ankle pain, deep squatting pain, claudication after walking for a long time, and activity limitation. 2. Anterior impingement syndrome of the ankle joint: anterior impingement osteoarthritis is caused by repeated direct or indirect trauma. Anterior impingement in soccer players is mostly caused by direct trauma in front of the plantarflexion position. High jump, long jump, basketball, javelin and other sports are also prone to anterior impingement. The manifestations are anterolateral ankle pain, deep squatting pain, and activity limitation. 3. Anterior medial ankle impingement syndrome: including bony impingement (mostly caused by various traumatic injuries), soft tissue impingement (impingement after ankle sprain). The manifestation is anterior medial ankle pain, which is aggravated when ankle plantarflexion is turned inward, and may be accompanied by medial popping and strangulation. 4. Ankle tendon injury: mostly caused by collision and heavy physical labor. In addition to the above reasons, flat feet, lateral collateral ligament injury of ankle joint can also cause the above symptoms. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment.