Left bunion pain can be caused by physiologic pain, trauma, osteoarthritis and gout. 1. Physiological pain:Left bunion pain can also occur if you walk excessively for a long time or wear ill-fitting shoes. 2. Trauma: Left bunion pain may occur when the patient’s left bunion is hit by a heavy object or bumped. 3. Osteoarthritis: Osteoarthritis is caused by degenerative changes in the joints, which may lead to pain in the left bunion, usually accompanied by joint stiffness. 4. Gout: Gout is a disease caused by purine metabolism disorders and hyperuricemia induced joint pain, the patient may appear left toe pain, as well as joint redness, swelling and deformation and other symptoms. When the patient appears left toe pain, should promptly go to the hospital for consultation, after the cause of the disease and actively cooperate with the doctor for treatment.