Blood pressure: How low can you go? . What's considered low blood pressure for you may be normal for someone else. Most doctors consider chronically low blood pressure too low only if it causes noticeable symptoms. Current guidelines identify normal blood pressure as equal to or lower than 120/80 - many experts think 115/75 is even better. Athletes and people who exercise regularly tend to have lower blood pressure and a slower heart rate than do people who aren't as fit. So, in general, do nonsmokers and people who eat a healthy diet and maintain a normal weight. . Some experts define low blood pressure as readings lower than 90 systolic (top #) or 60 diastolic (bottom #) You need to have only one number in the low range for your blood pressure to be considered lower than normal. In other words, if your systolic pressure is a perfect 115, but your diastolic pressure is 50, you're considered to have lower than normal pressure. A sudden fall in blood pressure can also be dangerous. A change of just 20 mm Hg - a drop from 110 systolic to 90 systolic, for example - can cause dizziness and fainting when the brain fails to receive an adequate supply of blood. And big plunges, especially those caused by uncontrolled bleeding, severe infections or allergic reactions, can be life-threatening. . Please check out this link from the Mayo Clinic for more detailed information: http://www.mayoclinic.com/health/low-blood-pressure/DS00590/DSECTION=causes
The abnormal lowest blood pressure should be systolic pressure less than 100 mm of mercury. In addition to that, weakness, dizziness, and fainting raise are all a suspicion that one has a low blood pressure. You need to visit a doctor for more details.
I'm not sure. But I do have very low blood pressure myself. I found out I had it when I went to the doctor after experiencing the side effects of it. If you are possibly concerned about your blood pressure, I suggest get it checked out by a doc or look up the side effects online