Why Do I Get Dizzy When I Stand Up?

Getting dizzy when you stand up is not an unusual phenomenon. It usually lasts just a few seconds and then passes, but if you have really low blood pressure or are dehydrated, then it will last longer. So why do I get dizzy when I stand up? It is related with a complex system of blood vessels that will be explained in this article.

Why Do I Get Dizzy When I Stand Up?

The sensation of feeling dizzy when you stand up has the medical name of "orthostatic hypotension." Simply put, orthostatic hypotension is the phenomenon that happens when gravity takes hold of our circulatory system and causes blood from the veins in your head to rush out of the head, making the brain feel dizzy for a while until the blood from the arteries can replace the blood lost by the veins, restoring the blood pressure in the brain to its normal level. All in all, feeling dizzy is a common complication of having a too low blood pressure in the brain.

Common symptoms of having too low a blood pressure in the vein include feeling dizzy, light-headed, and having blurry vision. You may feel temporarily confused and a little bit nauseous. In some cases, you can sustain tremors of the muscles and, if the low blood pressure lasts for more than a few seconds, you can actually faint, although you will regain consciousness when you reach the ground.

It’s all a matter of gravity. When gravity takes hold upon standing up, about 800 cc of blood travel from the top parts of the body down to the legs, leaving more venous pressure in the legs than that exists in the brain. Fortunately, we are made with baroreceptors, which are sensors in the carotid arteries and in the aorta that sense that the blood pressure is low and put the heart on high alert to pump out more blood faster. The blood vessels located in the abdomen and legs will constrict to push blood upward to the brain. This all happens in a matter of seconds.

Underlying Causes of Orthostatic Hypotension

While you are wondering "Why do I get dizzy when I stand up?" you may be also wondering if there is anything wrong with you that needs medical attention. Fortunately, this is rarely the case and there can be reasons behind the orthostatic hypotension that are perfectly explainable.

How to Relieve the Dizzy Feeling When Standing Up

Rather than worrying about "why do I get dizzy when I stand up?" consider these home remedies that you can use to prevent or treat orthostatic hypotension. For example:

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