The causes of heat stroke include the following: environmental heat is the cause of the disease. Room temperature is too high, more than 35 ℃, the furnace and other heat sources under the strong radiation engaged in a certain period of labor; hot summer sun exposure, such as the absence of adequate measures to prevent heatstroke, heatstroke can occur. Even if the temperature is not very high, but the humidity is high and ventilation is poor, heavy labor in this environment, heat stroke can also occur. Patients with old age, physical decline, fatigue, obesity, alcohol, hunger, dehydration, salt loss, impermeable clothing, as well as fever, hyperthyroidism, diabetes, cardiovascular disease, congenital sweat gland deficiency and other diseases, taking atropine and other anticholinergic drugs that affect sweat gland secretion, etc., can become a cause of heat stroke in the summer.