Orthostatic hypotension is a low blood pressure which is known as postural hypotension. Orthostatic can cause you to feel dizzy or lightheaded. Dehydration, lengthy bed rest, heart problems, endocrine problems, nervous system disorders and after eating meals are some things that can trigger low blood pressure. Using medications that are used to treat high blood pressure mixed with other prescribe medications and over the counter medications can cause low blood pressure
as well. It is best to inform your physician on what medications are being taken to prevent hypotension.