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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Sudden Blacking Out?

I am 17 and i have passed out 4 times within the last 3 years. Each time i have felt lightheaded, nerveness, warm sick feeling, tunnel/cloud dot version then i pass out, twice i have only thrown up after. The first time was when i was 14 and came from outside from playing in the snow, i was feeling sick(syptoms above) so rush inside & started quickly removing my layers of clothing then next thing i know i woke up on the floor, idk how long i was there. Then the 2nd time i believe it was because the sight of blood & fear. But the 3rd time i was outside tanning. And the 4th time i was just standing and it happen.
Mon, 13 Oct 2014
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Neurologist, Surgical,  's  Response
Hi, I had gone through your question and understand your concerns. The problem you describe may be syncope( first three times). Syncope happens mostly due to abnormal ( low) blood flow to brain from different reasons ( cardiac, loss of blood vessel tone etc.) mainly during stress, fatigue, very high or very low temperatures, or low blood sugar. The fourth time seems more like seizure, so I suggest you to visit a Neurologist and a Cardiologist to discus the cause of your black out. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
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What Causes Sudden Blacking Out?

Hi, I had gone through your question and understand your concerns. The problem you describe may be syncope( first three times). Syncope happens mostly due to abnormal ( low) blood flow to brain from different reasons ( cardiac, loss of blood vessel tone etc.) mainly during stress, fatigue, very high or very low temperatures, or low blood sugar. The fourth time seems more like seizure, so I suggest you to visit a Neurologist and a Cardiologist to discus the cause of your black out. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.