What is it called when you stand up too fast and you seem to black out?

Question

A lot of times if I'm really tired or I've been lying down or sitting down for a long time and I stand up suddenly, everything in my vision fades to black and I feel lightheaded and dizzy. What is that called? I've fainted one time when it happened. Is it normal for this to happen often or is something wrong with me?

Answer 1

Nothing is wrong with you, Dont worry

the way the body circulates our oxygenated blood to all origins, is threw the arterys , and thats by widening and close the artery's, (just like when you have a hose and you want the water to go far you'll tighten the tip)

what happens when you suddenly stand up, it may take a split sec for your artery to react,  

Answer 2

As another poster suggested, orthostatic hypotension plays a big part, but there's also another component called neurocardiogenic syncope.  Normally, when you stand up, blood vessels in your legs constrict to force blood back to the heart.  With neurocardiogenic syncope, a temporary dysfunction of the autonomic nervous system prevents that constriction.  So you stand up, the blood pools in your legs, and you faint.

It's important to note that heat exposure can cause neurogenic syncope, and the dehydration that heat exposure causes decreases the circulating blood volume.  The two together are very likely to cause you to black out.

A single episode of syncope is probably nothing to worry about, but if this has happened several times it might be worth it to see your doctor.  There are treatments (such as beta blockers) that you could try.

Edited: Was it really hot where you traveled?

Answer 3

I'm not sure what it's called, but it is CAUSED by you blood pressure not equalizing properly.

When you lie down, you heart does not have to work against gravity, so your blood pressure lowers.  When you stand up, you suddenly need the extra pressure, but your heart hasn't caught up with it yet.  So you get less blood to you brain and to start to pass out.

First off, take things a little slower.  when lying or sitting, don't stand up too fast.

It is NOT normal for this to happen frequently.  Youshould discuss this with your doctor.

Answer 4

It's called orthostatic hypotension. Your blood pressure drops and takes a bit to adjust when you stand up suddenly. Make position changes gradually and talk to your doctor. This can be a side effect of some medications. Hope this helps:)

Answer 5

The other term applied to this is postural hypotension. It happens to many of us from time to time but it should not be frequent. You don't mention your age but I assume that you are a young adult, so if it persists or happens on a daily basis,  and you are not otherwise ill or taking medications, a trip to your physician may be in order.

Answer 6

it's called headrush, and yes it's normal. If you exercise, stay and eat fit, it goes away becasue your heart is healthier.

Answer 7

Orthstatic hypotension.  

Orthostatic hypotension is primarily caused by gravity-induced blood pooling in the lower extremities, which in turn compromises venous return, resulting in decreased cardiac output and subsequently lowering of arterial pressure. For example, if a person changes from a lying position to standing, he or she will lose about 700 ml of blood from the thorax. It can also be noted that although there is a decreased systolic (contracting) blood pressure, there is actually an increased diastolic (resting) blood pressure. However, the overall effect is an insufficient blood perfusion in the upper part of the body.