A bunion is an enlargement of bone at the base of the big toe, called the metatarsal phalangeal joint. It forms within the bone or tissue as the big toe joint moves out of place. This forces the toe to be bent toward the others, often causing a painful lump of bone on the side of the foot. Since this joint carries a majority of the body’s weight while walking, bunion pain can cause extreme difficulty. The metatarsal phalangeal joint may become stiff and sore, making wearing shoes difficult or impossible. Symptoms can include bony prominence at the big toe joint, redness, swelling, pain, callus, and limited motion of the joint. A similar formation can form on the small toe joint. This is known as a bunionette or tailor’s bunion.