Normal human blood pressure has a high pressure of 90-140 mmHg and a low pressure of 60-90 mmHg. If the blood pressure is between 70-90 mmHg, it is considered hypotension. Hypotension may be caused by malnutrition, hemorrhage or violent vomiting or diarrhea. If the patient is unconscious, pale and other shock symptoms, he or she needs to be resuscitated in hospital. If the low pressure is between 70-90mmHg is basically normal, if the low pressure is close to 90mmHg, although in the normal range, but it is a normal high value, if it is easy to develop hypertension in young people, such cases should pay attention to the close monitoring of blood pressure changes. If the low pressure is 70mmHg and the high pressure is 90mmHg, the blood pressure is normal low value. It is recommended that patients should pay attention to a balanced diet, supplement nutrition, and eat more milk, eggs, beans and other foods rich in high quality protein to avoid hypotension.