Seven distinct symptoms of severe HFMD. The key to preventing HFMD is to pay attention to family and surrounding environmental hygiene and personal hygiene. Both adults and children should wash their hands with soap or hand sanitizer before and after meals and after going out; do not drink raw water and do not eat cold food; ventilate the living room frequently; and dry clothes and blankets regularly. During the epidemic period, parents should not take their children to public places with crowded and poor air circulation, and should avoid contact with sick children. Parents should check the baby’s palms, feet and mouth for abnormalities every morning and pay attention to changes in the child’s body temperature. It is crucial that parents do not chew food and feed it to their babies. If a preschooler or infant has a persistent high fever, rash or invisible rash on the hands, feet, throat and arms, parents should suspect the possibility of HFMD and go to the hospital early. The 2010 edition of the HFMD Diagnostic and Treatment Guide makes clear provisions for the early identification of severe cases of HFMD, which parents should keep in mind: 1. Persistent high fever that does not subside. 2. Poor spirit, vomiting, easy to be frightened, shaking limbs and weakness. 3. Increased respiration and heart rate. 4, cold sweat, poor peripheral circulation. 5.High blood pressure. 6.Significant increase in peripheral blood white blood cell count. 7.High blood sugar. Patients with the above characteristics, especially those under 3 years of age, should be closely observed for changes in their condition, necessary auxiliary examinations, and targeted rescue and treatment. Most of the disease has a good prognosis and does not leave sequelae. Severely ill children can cause serious complications such as meningitis, encephalitis, myocarditis, flaccid paralysis and pulmonary edema.