The following causes are common: 1. flat feet, congenital causes of changes in the longitudinal arch of the foot, the arch of the foot is prone to strain when the patient walks, so painful symptoms will occur at the big toe, and the symptoms will be relieved by reduced activity. 2. bunions, the big toe tilted to the outside, can produce bunions, wear and tear by the upper for a long time, painful symptoms are more serious, and the pain is more pronounced when walking. The pain is more pronounced when walking. X-rays can reveal significant changes in the line of force of the bunion. 3. Osteoarthritis of the first metatarsal toe and interphalangeal arthritis of the bunion are degenerative osteoarthropathies that gradually worsen with the patient’s age, and the pain is more pronounced when walking under weight, and is accompanied by joint deformation, joint narrowing, and bone growth around the joint.