A high pressure of 100mmHg and a low pressure of 45mmHg are not normal. High pressure is normal and low pressure is low, which may be caused by unreasonable work and rest or eating habits, or may be caused by aortic valve insufficiency. Normal blood pressure is defined as systolic blood pressure <120mmHg and diastolic blood pressure <80mmHg. Because diastolic blood pressure is 45mmHg and diastolic blood pressure <60mmHg, it is not normal. Unreasonable work and rest or diet habits may lead to lower blood pressure. In daily life, you need to strengthen physical exercise to improve the body's regulatory function. It is important to increase physical exercise in daily life to improve the body's regulatory function, take salt supplements and drink plenty of water to increase blood volume. Aortic valve closure insufficiency may also cause low blood pressure. If there are low perfusion manifestations caused by low blood pressure, such as dizziness, fatigue, blurred vision, memory loss, etc., it is recommended to go to the hospital in time to do some relevant tests to avoid delaying the condition. When abnormal blood pressure occurs, you should consult the doctor in time, and you should follow the doctor's instructions.