Hand-foot-and-mouth disease is an illness that causes sores in or on the mouth and on the hands, feet, and sometimes the buttocks and legs. The sores may be painful. The illness usually doesn't last more than a week or so. Hand-foot-and-mouth disease is common in children but can also occur in adults. It can occur at any time of year but is most common in the summer and fall. Hand-foot-and-mouth disease is caused by a virus called an enterovirus. Case Study Of Master X Master x, 5 years old male,presented with a historyof fever,sore throat,blisters on hand,legs and in mouth by physical examination master x is diagnosed as hand,food and mouth disease. Definition Hand-foot-and-mouth disease — a mild, contagious viral infection common in young children — is characterized by sores in the mouth and a rash on the hands and feet. Handfoot-and-mouth disease is most commonly caused by a coxsackievirus. Incidence This hand,foot and mouth disease occur in childhood,under 5 years .