Bunion pain is commonly caused by the following reasons: First, consider bunions. When bunions occur, the medial side of the first metatarsal will protrude medially, and the medial side of the first metatarsal will rub against each other when walking, thus forming a bunion, which will cause pain at the base of the metatarsal, and will be accompanied by redness and swelling. Second, consider gouty arthritis, such as often drink a lot of alcohol or high purine diet, will cause the accumulation of gouty crystals in the first metatarsophalangeal joint, often manifested as the first metatarsophalangeal joint redness, swelling, heat, pain, especially in the morning when the pain will be very obvious. Third, consider plantar fasciitis, the termination point of plantar tendon membrane in the base of the metatarsal bone, if usually too much weight walking, may cause plantar tendon membrane strain, thus manifesting as pain in the base of the metatarsal bone.