The causes of pain in the bone next to the foot include bunion, gouty arthritis, etc., which are as follows: a. Bunion: As the thumb turns outward, it will cause the first metatarsal bone to protrude inward. When wearing shoes, the inner surface of the shoe will rub against the head of the first metatarsal bone, and over time, bunions will form, so there will be pain in the inner bones of the foot. Second, gouty arthritis: gouty arthritis is the high incidence of the first metatarsophalangeal joints, that is, the bones next to the foot red, swollen, hot, painful, mostly due to a high purine diet, a large number of alcohol, resulting in increased blood uric acid. This results in gouty crystals, which are deposited in the first metatarsophalangeal joint, thus causing acute pain in the joint.