Flat feet can cause plantar fascia tension and nerve damage after prolonged walking, thus causing clinical manifestations of paralysis and spasm. The main clinical feature of flat feet is the collapse of the medial longitudinal arch of the foot, which is manifested as the low level of the foot arch. Prolonged walking will cause tension in the plantar muscles and fascia, and in serious cases, it will cause damage to the nerves of the plantar foot, which will manifest as paralysis, pain and spasm, and need active treatment. In order to avoid discomfort, it is recommended to reduce prolonged walking, take sufficient rest, carry out functional exercises under the guidance of a doctor, and use orthopedic insoles or wear orthopedic braces if necessary. People with flat feet are advised to consult a doctor for timely exercise and correction to avoid other complications.