The severity of low blood pressure depends on the assessment of the condition. If it is physiological hypotension and there is no discomfort, it does not need treatment and is not serious for the time being, if it is pathological factors causing low blood pressure, it is more serious and requires active treatment of the primary. Usually when the blood pressure is lower than 90/60mmHg is called hypotension, the normal value of blood pressure is less than 120mmHG systolic blood pressure, diastolic blood pressure is less than 80mmHG, hypotension is affected by personal constitution, young and thin women, blood pressure may be lower than normal, if there are no obvious symptoms, at this time should strengthen nutrition, if necessary, need to give pressure-raising drugs to regulate treatment. Pathological factors are commonly acute shock, myocardial infarction, acute cardiac compression, insufficient fluid volume, excessive use of antihypertensive drugs, allergy to sedative drugs, heavy infection can cause blood pressure below normal, actively correct the causes of hypotension symptoms, symptomatic pressure-raising treatment.