Pain in the middle of the foot has the following conditions: 1, plantar tendinitis: may be caused by excessive walking or weight-bearing sports activities, such as frequent up and down stairs, mountain hiking or often carrying heavy bags walking, hiking, can cause the plantar tendon membrane to be subjected to a progressive increase in load. Due to the accumulative strain on the plantar tendon membrane, over time there will be microfibrous rupture of the plantar fascia, there will be aseptic inflammation of the fascia, manifested as pain in the middle of the foot; 2, flatfoot syndrome: flatfoot syndrome when the root of the foot will collapse, the load on the plantar tendon membrane is greatly increased, in the normal amount of activity will easily cause aseptic inflammation of the plantar tendon membrane, manifested as pain in the middle of the foot.