Bunion pain may be related to physiological factors, or it may indicate the presence of acute injury, bunion, gingivitis, arthritis. 1. Physiological factors: for example, wearing inappropriate shoes, causing mild compression on the thumb, pain symptoms may occur, usually mild pain, after replacing the appropriate shoes, can be improved on their own. 2. Acute injury: For example, heavy objects or excessive pressure, resulting in localized damage to the thumb, which will cause pain, and may also be accompanied by significant swelling and redness. 3. Bunion: It may be caused by heredity, improper wearing of shoes, etc. When the bunion is more serious, the localized friction of the shoe upper will cause pain, accompanied by redness, swelling and fluid accumulation, and even affect daily walking. 4. Infertitis: it may be related to improper trimming of toenails, local injuries and other factors, so that there is a bacterial infection in the nail area of the bunion, and after the infection worsens, it will lead to pain in the bunion, and when it is serious, it will also flow out pus. 5. Arthritis: when there are various types of arthritis in the joint area of the thumb, it will also cause pain in the thumb, such as gouty arthritis, degenerative osteoarthritis, rheumatoid arthritis, etc., accompanied by redness, swelling and other symptoms, and when serious, it will lead to local deformity. If the pain in the thumb is accompanied by other abnormal manifestations, it is recommended to consult a doctor for examination and treatment to avoid adverse effects.