Coronary heart disease tends to occur less often in the summer than in the winter, but that doesn’t mean that patients or people at risk can take it lightly. This is because the incidence of coronary heart disease is relatively higher in the summer than other common diseases. This is due to the fact that when the temperature rises, the body’s subcutaneous blood vessels dilate and the blood flow to the skin increases 3 to 5 times more than usual, while the amount of blood returning to the heart decreases, which directly affects the blood supply to the heart muscle. In this environment, sympathetic excitability increases, heart rate accelerates, coronary arteries constrict, and myocardial oxygen supply decreases, which greatly increases the risk of coronary heart attack. To prevent coronary heart attack in summer, coronary heart disease patients, especially the elderly coronary heart disease patients, should start from the following aspects. First, in outdoor activities, coronary heart disease patients should do a good job to prevent heat, wear a sun hat and have enough water. When indoors, you can turn on the air conditioner, but the temperature should not be too low, it is more appropriate to keep it around 25 degrees. When exercising, you should choose to do it in the cooler morning, do not exercise in the hot sun, and shorten the exercise time. If the weather is hot and humid, outdoor exercise should be reduced or even stopped. Second, coronary heart disease patients to maintain a healthy mood, only psychological balance to physiological balance, the normal function of the organs, blood flow, away from the threat of heart attack. Third, the diet of patients with coronary heart disease should be based on light, but not that quit meat, you can eat some lean meat, fish, try to eat less too greasy or high-fat food. People with coronary heart disease can also eat more fresh vegetables, fruits, black fungus, soy products, to ensure the intake of fiber, as well as balanced nutrition. Fourth, patients with coronary heart disease should not get up too early in the morning if they go to sleep late at night, and should rest properly at noon to supplement the lack of sleep. Half an hour before bedtime or after waking up in the middle of the night and early in the morning, coronary heart disease patients had better drink some boiled water in moderation. In addition, patients with coronary artery disease should keep their bowels open and develop the habit of having a regular bowel movement once a day. Finally, patients with coronary heart disease must quit smoking, the harm caused by smoking is very big. The type or dosage of medication used by patients with coronary heart disease may vary in summer, so it is recommended that adjustments be made under the guidance of a doctor. Summer is also the season for travel, so patients with coronary heart disease should carry anti-angina medication with them in case they need it.