BUNION, an inflamed swelling of the sac containing synovial fluid on the metatarsal joint of the big toe, or, more rarely, of the little toe. This may be accompanied by corns or suppuration. The cause is prolonged compression of the toes in a narrow and pointed boot so that the great toe is deflected outwards instead of pointing directly forwards. Use of sufficiently wide footwear and palliative treatment by dressings, etc., are usually effective, but in obstinate cases a surgical operation may be considered.