www.sofootankle.com A bunion is a general term for a bump on the great toe joint. The actual term is hallux valgus, which is a term you’re not going to remember. But what happens is the big toe drifts over against the toe next to it (the second toe), and the joint where you see the bump is actually the joint moving out. So the bone drifts out; the toe drifts over against the other toe. Sometimes you can get more bone production or more bone spurring on the bump. So the term bunion is that bump that you see, but the whole thing is this slowly dynamic deformity where the toe drifts over and the joint moves out.