Pain in the tendon at the dorsum of the foot and ankle joint may be caused by physiological factors such as foot training and prolonged running, as well as pathologic factors such as ankle injuries, tendonitis and fasciitis. 1. Physiological factors: Due to foot training, long time running and other factors, the soft tissues at the ankle are overly stretched, which can cause pain at the dorsum of the foot and ankle joint. Adequate rest and reduction of ankle activities can gradually relieve it. 2. Ankle injury: due to broken foot, trauma and other factors, it can lead to laceration of ankle ligaments and surrounding soft tissues, which can cause pain in the tendon at the dorsum of the foot and the ankle joints, accompanied by swelling, limited movement and subcutaneous bruising. 3. Tendonitis: Due to long time jumping, ankle training and other factors, the surrounding tendons are overused and repeatedly pulled, which can eventually cause localized aseptic inflammation, leading to tendonitis and pain at the dorsum of the foot and ankle joint. 4. Fasciitis: Aseptic inflammation of the soft tissues on the back of the foot caused by prolonged strain leads to fasciitis and pain in the ankle. Tendon pain at the joint of instep and ankle may also be caused by other reasons. Once the pain is severe or cannot be relieved, you should go to the regular hospital in time to find out the cause and carry out targeted treatment.