"Are bunions hereditary, and how can I minimize the possibility of one developing? Bunions are an enlargement of bone on the big toe. The bone structure in our feet has a genetic and hereditary component. For example, if a parent or grandparent has a bunion, chances are much greater that you can develop a bunion as well. Wearing shoes that are very narrow in the toe box area or high heels can increase the likelihood that you will develop a bunion. "