The Suwen – Heat Theory says: “Those who become warm with typhoid fever are first sick with warmth on the summer solstice, and then sick with summer heat on the summer solstice.” In the hot summer, due to high temperature, high humidity, strong heat radiation and other reasons, the body’s temperature regulation, water and salt metabolism and other normal physiological function disorders, prone to heat stroke. Heatstroke is an acute disease caused by heat balance and water and salt metabolism disorders in a hot environment, with central nervous system and cardiovascular system disorders as the main manifestations. High temperature, high humidity, weakness, excessive labor intensity, overexertion, etc. can easily induce heat stroke. The symptoms of heatstroke can be mild or severe. Mild heatstroke can cause dizziness, fatigue, chest tightness, palpitations, nausea, excessive sweating, flushing, and elevated body temperature. In severe heat stroke, there can be a lot of sweating, blood pressure drop, muscle cramps, and even fainting, impaired consciousness, coma, etc. Prevention and precautions for heat stroke: 1. Drink plenty of water. In hot weather, regardless of the amount of exercise to increase fluid intake. Do not wait until you are thirsty before drinking water. 2, pay attention to salt and mineral supplementation. Because sweating leads to loss of salt, try to drink tea, mung bean soup, paste rice soup. Avoid drinking iced drinks that are too cold to avoid stomach cramps. 3. Try to stay indoors as much as possible. If conditions allow, air conditioning should be turned on. If the air conditioning is not installed at home, you can use public places such as shopping malls or libraries to escape the heat. Take a cold shower or turn on the air conditioner to cool the body more effectively. 4, travel should try to avoid the midday hours, outdoor activities should be selected in the shade. When you go out, properly apply sunscreen and use a sunshade. 5. Outdoor exercise should be reduced when the heat is high. If you must exercise outdoors, you should drink 2-4 glasses of non-alcoholic cold beverages every hour. Sports drinks can help replenish the salt and minerals lost through sweat. Although all kinds of people can be affected by heat stroke, infants and children, the elderly, people with mental illness and chronic diseases such as heart disease and hypertension are more at risk and should be given extra attention. For these high-risk groups, special attention should be paid in hot weather to observe whether signs of heatstroke appear in a timely manner.