What's behind my low blood pressure?

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, heart failure or heart attack, dehydration, a severe allergic reaction (anaphylaxis), advanced diabetes, going into shock, irregular heartbeat (arrhythmia).
(Source: HealthDay News)