Pain in the dorsum of one foot requires vigilance against trauma, tenosynovitis, flat feet, and arteriosclerosis. 1. Trauma: dorsal pain occurs when one foot is hit by a heavy object. 2. Tendovaginitis: Tendovaginitis is a damaging inflammation of the tendon and tendon sheath that occurs when the tendon rubs excessively in the tendon sheath for a long time, causing swelling. When the tendon of the dorsum of the foot has tendovaginitis, there will be obvious pain, redness, swelling and fever. 3. Flat feet: also known as flat feet syndrome, usually caused by congenital heredity, but also some patients because of the formation of joint lesions. Due to the abnormal bone structure of the foot, the imbalance of plantar energy when walking will reduce the function of the foot and lead to instep pain. 4. Arteriosclerosis: Arteriosclerosis often results in cramps and pain in the hands and feet due to impaired blood supply. Especially after climate change and cold weather, the blood flow will slow down further, making the symptoms worse. To summarize, when one foot back pain, it is recommended to go to the hospital in time to check, clarify the cause of the disease and then timely treatment, so as not to delay the condition.