Bone protrusion on the inner side of the foot may be a physiological phenomenon, such as hereditary factors that cause the bone protruding from the bunion, or it may be caused by diseases, such as bone fracture, osteomalacia, gouty stone and so on. 1. Physiological phenomenon: If most people in the family have protruding bunions, then the patient is likely to be affected by hereditary factors, and usually there are no uncomfortable symptoms that need no treatment. 2. Fracture: If the patient has a fracture on the inner side of the foot, and the fracture is not handled in time or is not handled properly, it is easy to form a protrusion. 3. Osteophytes: If the patient suffers from traumatic injury or other causes of bone growth, the bone on the inner side of the foot may also bulge, and the osteophytes press on the surrounding soft tissues and may also cause pain. 4. Gout stone: gout patients with uric acid levels in the body for a long time is not well controlled, it is easy to form gout stone in the inner side of the foot, which in turn shows the inner side of the foot bone bulge, the patient needs to actively control the level of uric acid. Caused by the inner side of the foot bone bump more reasons, but also may be related to local inflammation, joint dislocation and other reasons, if accompanied by uncomfortable symptoms, it is recommended to promptly go to the hospital to identify the cause of the disease, targeted treatment.