Bunions can lead to diseases including bunions, osteoarthritis, plantar fasciitis, etc., as follows: First, bunions: Because in the case of bunions, the base of the first metatarsal will protrude medially, which will rub against each other and the inner side of the shoe, which will easily cause redness, swelling and inflammation of the bunions over time, thus causing severe pain on the inside of the foot and seriously affecting life. Second, osteoarthritis: bunions are prone to osteoarthritis of the first metatarsophalangeal joint, which can lead to degeneration of the first metatarsophalangeal joint and narrowing of the joint space, and therefore often cause joint pain on rainy days or when cold invades. Third, plantar fasciitis: bunions are more serious when the second toe is up, forming a sheep’s foot deformity, which will change the negative focus of the foot, easily causing plantar fasciitis, which can cause significant pain when walking.