What can cause one to experience mild and brief blackouts upon standing up?!

Question: What can cause one to experience mild and brief blackouts upon standing up?

I've never fainted, but I get mildly dizzy and do stumble for a few of seconds before I can adjust my balance. My vision goes blank and I feel somewhat lightheaded. It's not as serious as it sounds because it only lasts for a few seconds. What could be causing it?

Answers:

This very common phenomenon is known as orthostatic BP.

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Sounds like your soul is being possessed by the devil. The easiest way to rid yourself of this problem is to rinse yourself in the urine of an animal. Preferably a cow or swine. I pray that you should not undergo an exorcism. Be warned! -- Kidding, In all seriousness its from low blood pressure. Try drinking a glass of V8 at night, it should fix you all up!

I am this way too, I have asthma and have always thought it was from a lack of oxygen (I have to take my inhaler a couple times a day, my asthma is pretty bad)

It could be low blood sugar, I am mildly hypoglycemic, I get that from time to time. A dab of honey will make it stop.

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What can cause one to experience mild and brief blackouts upon standing up?!

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