High temperatures can cause vasodilation, which can lead to a drop in blood pressure. If the patient is currently hypotensive due to high temperature, it cannot be ruled out that it will trigger the appearance of myocardial ischemia. In a high temperature environment, it is recommended that patients try to stay in the shade to avoid malignant events. Especially for patients who have cardiovascular disease, they are relatively sensitive to high temperature or cold climate, which may trigger the appearance of angina pectoris symptoms and blood pressure fluctuations. It is recommended that patients with high blood pressure should adjust the dose of oral antihypertensive medication if they have high blood pressure during the day. This is why older adults are advised during the summer months and may need to have their antihypertensive medications reduced or discontinued when necessary, as hypotension is more damaging to the body than slightly higher blood pressure.