The heat wave that started on May 15th of this year has caused a sharp increase in the number of patients with heat-related illnesses. On the 8th, 202 people nationwide visited the emergency room for heat-related illnesses, and 3 of them died. The cumulative number of patients is 3,890, and the number of deaths is 26. Heat stroke mainly occurs in elderly men, and heat exhaustion is the most common symptom. It is important to refrain from outdoor activities during the heat wave and to consume enough water.