Throughout his life, Gloucester suffered from a recurrent "ague", which was treated with regular doses of Jesuit's bark (an early form of quinine) by his physician, John Radcliffe. Gloucester disliked the treatment intensely, and usually vomited after being given it. Possibly as a result of hydrocephalus, he had an enlarged head, which his surgeons pierced intermittently to draw off fluid. He could not walk properly, and was apt to stumble. Nearing the age of five, Gloucester refused to climb stairs without two attendants to hold him, which Lewis blamed on indulgent nurses who over-protected the boy. His father birched him until he agreed to walk by himself. Corporal punishment was usual at the time, and such treatment would not have been considered harsh.