Most commonly, a bunion is an enlargement of the big toe joint. It can also be an enlargement of the joint on the outside by your 5th toe. These can worsen if not addressed leading to problems walking and trouble fitting in shoes. Bunions can be treated surgically and non-surgically depending on the severity. While it is important to treat the bunion, it also is important to determine its cause. Diagnosing and treating the cause prevents the bunion from recurring and/ or worsening.