Blood pressure of 80/50mmHg is not necessarily dangerous, if the basic blood pressure is low, there is generally no danger, if the basic blood pressure is normal, it is more dangerous.
If the basal blood pressure is low, for example, if the blood pressure fluctuates around 90/60mmHg, and the measurement of blood pressure reveals 80/50mmHg, which is not accompanied by any uncomfortable symptoms, then there is generally no danger.
If the basic blood pressure is at the normal level or a higher level, measuring blood pressure found 80/50mmHg, then usually accompanied by symptoms such as impaired consciousness or even shock, then it is very dangerous, we must quickly replenish fluids, if necessary, transfusion of blood to maintain blood volume, and quickly find out the cause of the drop in blood pressure for symptomatic treatment.
To summarize, blood pressure 80/50mmHg is not necessarily dangerous, depending on the situation.