Protrusion of the thumb joint is medically often referred to as a bunion. Because this disease is particularly common, there is a lack of awareness about it, so it causes many patients to delay treatment. The causes are divided into three aspects: First, genetic factors, which is one of the main factors inducing bunions, it is actually invisible and accounts for 50% of the bunion onset factors in genetics statistics. Second, wearing high-heeled pointed shoes is the most common factor, especially common in women. The mechanism of bunion formation in high-heeled shoes is to stuff the foot into a hard triangular area, so that the bunion turns outward and externally, the little finger turns inward and internally, and the middle three fingers form a highly flexed state to achieve a specific type of bunion performance. Third, various inflammatory diseases cause, especially rheumatism, rheumatoid, trauma, infection and other factors, often lead to the formation of bunion outward deformity, but no second factor causes specific The second factor does not cause a specific type of foot deformity to manifest. The above are the common causes of bunions, we must pay enough attention to bunions according to the causes, do not let the disease cause great damage to everyone’s health, and only after that realize the seriousness of the problem, to know the combination of prevention and treatment, actively cooperate, and go to the hospital in time to check and solve the causes of the disease.