Whenever the summer is hot, the number of stroke patients in our hospital will increase dramatically. The main reason for this is the negligence of people in managing their existing chronic diseases and the lack of knowledge about summertime chronic disease management. The following is an example to draw inspiration. Master Zhang is a decorator, summer decoration wall, due to the rush, sweating, suddenly Master Zhang dizziness, numbness and weakness of the partial body. People thought that Master Zhang had heatstroke, rushed him to the hospital. Doctors check blood pressure Bp180/120mmHg, do brain MR examination, the results of the diagnosis of “cerebral infarction”. It is a stroke, and this kind of summer stroke is commonly known as “heat stroke”. Expert comment: Stroke is a common and frequent cerebrovascular disease in the middle-aged and elderly, and its mortality rate accounts for the first cause of death in the elderly. According to statistics, there are two peak periods for strokes throughout the year, one is the severe winter when the temperature is below 0 degrees Celsius, and the other is the summer when the temperature is above 30 degrees Celsius. In summer, when the weather is hot, the higher the temperature, the greater the risk of stroke. When the temperature rises above 32 degrees, especially when the relative humidity reaches more than 70%, the body temperature regulation mainly relies on the evaporation of sweat to dissipate heat, the body has to excrete 1000 ml or more of sweat every day. Sweating and a lot of water loss, if not timely replenishment, can cause “dehydration”, “dehydration” can reduce blood volume, blood thickening, blood circulation slowed down, micro thrombus easily formed, micro thrombus blocking cerebral vessels will cause “ischemic stroke”. In addition, Master Zhang’s usual high blood pressure is not timely detection and control is also an important reason for the occurrence of stroke cerebral infarction. Old Mr. Liu, 78 years old, suffering from cerebral infarction for 1 year, after treatment life is basically self-care, diet is very careful; stubbornly believe that stroke is caused by wind; do not listen to the doctor’s advice, do not dare to open the window, and do not dare to open the air conditioning. One day early in the morning, he found that his right limb was paralyzed and his language was unfavorable; fortunately, he sought medical attention in time and was clearly diagnosed with “cerebral infarction” by CT. After timely treatment, no significant sequelae were left. Experts commented that in the hot summer, Mr. Liu did not dare to open the window or open the air conditioning, sweating water loss, coupled with the elderly do not feel obvious about the lack of water, resulting in the lack of timely replenishment of water, thick blood, into the night blood circulation slowed down, easy to form thrombosis, resulting in cerebral infarction. Remind patients, especially elderly patients, must be timely hydrated in the summer, not thirsty also need to drink more water, appropriate salt supplement (daily salt intake per person shall not exceed 5 grams.). ;Drink a moderate amount of water when waking up in the middle of the night to reduce blood consistency, which is greatly beneficial to the prevention of thrombosis. Air conditioning temperature is 27-28 degrees, pay attention not to blow directly, pay attention to regularly open the window ventilation, keep the indoor air fresh.