Many people worry about high blood pressure and how to bring it under control. But low blood pressure also can be a medical problem, perhaps leading dizziness, fainting or fatigue.
The U.S. National Library of Medicine lists these common causes of low blood pressure (medically called hypotension):
-A side effect of medications, such as certain antidepressants, diuretics, painkillers or heart medicines.
-Alcohol use.
-Heart failure or heart attack.
-Dehydration.
-A severe allergic reaction (anaphylaxis).
-Advanced diabetes.
-Going into shock.
-Irregular heartbeat (arrhythmia).