The heat still has an effect on blood pressure. When the air is hot, the speed of blood circulation is accelerated, and this increased speed may generally lead to a lower blood pressure than usual, but generally not much lower. When the weather is colder, blood vessels contract, which may lead to poor vascular elasticity, resulting in an increase in blood pressure. In general, for patients whose blood pressure is around 140/90 mmHg, it is recommended to pay attention to diet, low-fat, low-salt diet, and moderate exercise every day to maintain emotional stability, which is conducive to a stable blood pressure. If a patient with high blood pressure experiences dizziness, chest tightness, and weakness, and the blood pressure is greater than 140/90 mmHg, it is recommended to routinely take oral antihypertensive drugs.