Hand, foot and mouth disease (HFMD) is most common in children under the age of 5, but adults can also get HFMD. HFMD is mainly caused by enterovirus infection, which is contagious and can be spread through the digestive tract, respiratory tract and close contact, etc. The incidence of the disease is mainly in children under the age of 5, and some adults may also suffer from HFMD. Children usually have fever, herpes, ulcers, cough, loss of appetite and other symptoms, and in severe cases, drowsiness, coma, severe headache, vomiting and other symptoms. Adults have relatively strong resistance and may not show obvious symptoms after the disease, or they may show mild fever, skin rash on hands and feet. If an adult is infected with HFMD, he/she should avoid contact with children to avoid causing them to become infected.