Generally not normal. Normal people’s blood pressure is 90-140/60-90mmHg. 80/40mmHg below normal is abnormal and is considered to be low blood pressure, which may cause dizziness and other symptoms and requires prompt medical attention. Some young, thin women may also have low blood pressure but no symptoms, so they can be observed. Low blood pressure generally refers to the systolic blood pressure is lower than 90mmHg or diastolic blood pressure is lower than 60mmHg, at this time the patient may appear dizziness, blurred vision, pale, fatigue, nausea and other symptoms, serious cases may lead to fainting, transient cerebral ischemia and so on. At this time, it is necessary to consult a doctor in time for examination, to clarify the causes of low blood pressure, you can usually increase the amount of water, appropriate exercise for the regulation of blood pressure, and in serious cases, you can use hydrocortisone and other drugs for treatment. If the blood pressure is 80/40mmHg, and combined with uncomfortable symptoms, you should consult a doctor in a timely manner, and the drugs mentioned above should be used under the guidance of a doctor.