A bunion is a bony bulge along the edge of the foot, next to the base of the big toe. It's associated with misalignment of the first toe joint. Anyone can get them, especially if they wear ill-fitting or uncomfortable shoes. It often shows up as people age. People with bunions often also have hammertoes as well.
Try changing to more comfortable shoes or wearing shoe inserts. If you’re still in pain, your doctor may suggest surgery.