The main reason why hypertensive patients are afraid of heat is that high temperature can cause increased heart rate, irritability, sweating, panic, increased blood pressure, headache, dizziness and so on. 1. High temperature affects cardiovascular and cerebral vessels: Elevated temperature can lead to tachycardia, atrial or ventricular premature beats, elevated blood pressure, headache, dizziness, panic, chest tightness and other symptoms. 2. High temperature affects the mood: hot weather for hypertensive patients can lead to bad mood, irritability, sweating, sleep deprivation and so on. 3. High temperature aggravates complications: for example, when hypertensive patients are combined with hyperthyroidism, due to the increase of basal metabolic rate, the patients may have the symptoms of sweating and fear of heat, and also panic, irritability, etc. Therefore, for hypertensive patients, they should pay attention to the symptoms. Therefore, for hypertensive patients should pay attention to the prevention of summer heat, to prevent the occurrence of cardiovascular and cerebrovascular disease, at the same time to regularly measure blood pressure, take medication on time, so that blood pressure control standards.