Systolic blood pressure of 90 mmHg is the lower limit of normal, diastolic blood pressure of 50 mmHg is below the normal range, and overall this blood pressure is considered hypotension. There are many causes of hypotension, and hypotension in middle-aged and elderly groups is associated with decreased heart function, with common causes including myocardial infarction and heart failure. If a patient has had coronary heart disease for many years and has hypotension accompanied by large chest pain or toothache or abdominal pain, promptly do an electrocardiogram to see if it is an acute myocardial infarction, which may even cause ischemic cardiomyopathy and may seriously cause heart failure. The general decline in spleen and stomach function in the elderly can lead to violent vomiting due to careless eating, and a short period of time can also lead to hypotension due to a large loss of body fluids and insufficient blood volume. Young and middle-aged female weight loss groups want to quickly achieve their weight loss goals, so they take excessive dieting, which can lead to malnutrition hypotension, the main symptoms of which are low blood pressure accompanied by dizziness, weakness, and mental weakness. Other people belong to familial hypotension, although the blood pressure is low, but there is no clinical manifestations, and energetic, need to regularly monitor blood pressure, feel sick promptly to seek medical attention.