The cause of bunion formation is related to a variety of factors, on the one hand, it may be caused by genetic factors, on the other hand, it may be related to the repeated stimulation of the acquired. 1. Genetic factors: The complete pathogenesis of bunion is still unclear, but most scholars believe that there is a strong relationship with congenital genetic factors, that is to say, most of the bunion patients who appear in their young and middle-aged years have the phenomenon of family aggregation. Congenital factors may lead to abnormalities in the arch of the foot, imbalance of muscle tone in the bunion area and other developmental deformities, causing laxity of the first metatarsophalangeal joint to appear bunion. 2. Acquired stimuli: Acquired bad footwear habits may also lead to bunion, in which female patients are more common, mainly due to the female population have the habit of wearing high-heeled shoes, pointy shoes, resulting in the front part of the foot is squeezed, resulting in the forefoot load increased, the first metatarsophalangeal joints excessive dorsiflexion compensation, and the bunion appeared in the course of time. If a bunion is diagnosed, early treatment is recommended to minimize the adverse effects of the disease.