The back of the foot pain after waking up is considered to be related to physiological factors, and may also be caused by pathological factors, such as rheumatoid arthritis, gout, tenosynovitis, etc.. 1. Physiological factors: such as too much exercise or sleep at night feet are caused by pressure, through rest can generally be relieved. 2. Rheumatoid arthritis: symmetrical swelling of the joints, pain, morning stiffness, restricted movement and other manifestations. Laboratory tests for rheumatoid factor are mostly positive. 3. Gout: localized redness, swelling, fever, pain, and elevated uric acid. 4. Tenosynovitis: aseptic inflammation of the tendons and tendon sheaths in the feet, resulting in pain in the instep and limitation of activities, which can be alleviated by rest and topical diclofenac diethylamide cream. Waking up with pain in the back of the foot, if it does not get better after resting, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease and then treated under the guidance of the doctor.