My father almost died on a cruise. He has serious Diabetes/Heart issues, and from eating too much, his heart went into Bradycardia (slow erratic rhythm). They kept him alive on the ship quite well, left him in Cozumel in one of Carnivals "recommended Hospitals". The nurses don't speak English, they did not use gloves and did not have food during the weekend. You don't really want to get sick on a cruise.