The causes of bunion are related to heredity, poor shoe-wearing habits, congenital abnormalities of the foot structure, age, disease and other factors. 1. Heredity: bunion has a certain genetic factor. If parents have bunion, the chance of their children suffering from bunion will increase, and it is a common cause of bunion in teenagers. 2. Bad shoe habits: If you often wear high heels or pointy shoes, the foot will be squeezed into a small space, and walking in such shoes for a long period of time will easily induce bunion. 3. Congenital anomalies of the foot structure: If you suffer from some congenital diseases, such as flat feet or bunions, it is also easy to cause bunion. 4. Age: As the foot grows older, the stability of the muscles and fascia at the bottom of the foot decreases, making it easier for a bunion to occur. 5. Disease: Inflammatory diseases such as rheumatoid arthritis, gout, and joint trauma can also cause bunions. There are many other causes of bunions. If you have a bunion, it is recommended that you seek prompt medical attention to minimize the adverse effects of the disease.