Inadequate blood supply in the elderly can be dangerous, whether it is inadequate blood supply to the brain or inadequate blood supply to the heart. Elderly patients with hypertension, diabetes, hyperlipidemia, and usually poorly controlled blood pressure and blood sugar will have varying degrees of atherosclerosis as they age, and those with hypertension and diabetes will have a more severe degree of atherosclerosis. If there is a long-term lack of blood supply to the brain, patients will have dizziness and lightheadedness, and it is easy to form brain infarction, especially posterior circulation infarction, such as small brainstem infarction, its very dangerous. If there is long-term poor blood pressure and blood sugar control will also cause the manifestation of insufficient blood supply to the heart, and patients will have the manifestation of ischemic cardiomyopathy, such as having heart panic and chest tightness, and in severe cases, it will cause acute myocardial infarction attack and chest pain. If there are arrhythmias, sudden death can occur, so the elderly are at risk of insufficient blood supply.