The big toe is bunion. Factors that cause bunion may be related to genetic factors, bad habits, congenital deformities, foot inflammation and other factors. 1. Hereditary factors: Most of the bunions that occur in adolescents may be due to hereditary factors. 2. Unhealthy habits: Unhealthy shoe habits such as wearing high heels and pointy shoes, and walking or standing for a long period of time while wearing such shoes, can gradually lead to bunion phenomenon. 3. Congenital deformities: Congenital abnormalities of the foot structure, such as flat feet and bunions, can lead to imbalances in muscle tone, resulting in bunions. 4. Inflammatory diseases of the foot: Various inflammatory diseases of the foot, such as rheumatoid arthritis, can destroy the plantar bones and eventually lead to bunion deformity. A bunion is a bone deformity in which the first metatarsophalangeal joint of the toes is shifted to the outside of the thumb. Therefore, you should pay attention to wearing suitable and comfortable shoes and developing good walking habits. If a bunion occurs and is accompanied by discomfort, it is recommended that you seek medical attention at a hospital to clarify the cause of the problem and then give targeted treatment.