Flat feet, also known as flat feet, can be caused by congenital factors such as foot deformities, as well as acquired factors such as foot trauma, disease or chronic strain. 1. Congenital factors: foot deformities such as oversized navicular tuberosity, heel valgus, etc. can lead to the phenomenon of flatfoot syndrome. 2. Acquired causes (1) Foot trauma: such as violence or smashing and other accidents, which can lead to metatarsal fractures, metatarsal tarsal injuries, etc., resulting in damage to the foot bones and ligaments, which can lead to flatfoot syndrome. (2) Systemic diseases: such as rheumatoid arthritis, osteoarticular tuberculosis and other diseases, which can lead to pathologic destruction of foot bones and joints, causing flatfoot syndrome. (3) Chronic strain injury: long time walking, standing or heavy physical labor and other chronic strain injury, so that the maintenance of the arch muscles and ligaments and other soft tissues gradually weakened, resulting in the arch of the foot is gradually low and flat, the occurrence of flatfoot syndrome. There are many reasons for flatfoot, if it affects their quality of life, it is recommended that patients go to the hospital in time to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor, so as not to delay the condition.