This question cannot be answered correctly without more medical information. Could be anything from Type 1 diabetes to orthostatic hypotension (postural hypotension).
Many people when under stress..even a little, have very shallow breathing, without realizing it. Without sufficient oxygen the brain will not work. Deep breathing exercises will restore the needed oxygen. The other factor is water. If you're not drinking enough water, you can have the same reaction...fainting.
People can black out from giving or loosing blood. This is termed, in the medical field, a vasovagal reaction. The reason I know this is because it happened to me once in the military. The nurse took blood from me when I was standing up. Next she told me to get in line to receive my hepatitis B vaccine. I remember feeling dizzy, so I went to sit down at the closest chair. The next thing I know, I wake up laying on the drill hall floor with fellow soldiers all around me. One person was holding my head. I went to get up and they all yelled for me to remain laying down, and not to move. The reason they were holding my head was because I passed out head-first on the cement drill hall floor, from a standing position. I was ok but it was definitely a strange experience.
You can also pass out from standing in one place to long. If you do not slightly bend your knees, it will cut off the blood circulation to your feet, causing you to black out. I also learned this in the Army. We had to learn to stand at position of attention for long stretches without moving or shifting or footing.
I blamed out after being in the sun on a shady day for 8 hours. I have very fair skin we were on a large boat returning from lake , and I had to lie down. We took a cab home , and I blacked out in my house. Some bad parts of my skin had bandages pit on by doctor. When I peeled. I looked like a leper. Lesson learned. On shady days, the sun still peeks out at you.
by Phil Perez 8 years ago
I'd like an explanation why people would want to go to Montreal to visit? I know most people communicate in English, but most people in Montreal do not. But if that doesn't bother you enough to not visit, what things do you like/dislike about Montreal ?
by Lady_E 12 years ago
Reasons why people don’t bother with Church anymore....
by Grace Marguerite Williams 11 years ago
What are the FIVE top reasons why people of average intellect and less educationachieve levels of success which is deemed far beyond their intellectual and educational levels?
by Grace Marguerite Williams 11 years ago
What are the 10 reasons why people should wait until their mid-30s to marry and use their 20sas a relationship exploration period?The 20s are a time of relationship exploration. The 20s are not for marriage. The 20s are a time for self, career, and/or relationship exploration. ...
by tany_dcw 9 years ago
Blackouts while drinking began and getting more frequent, why? I have been a social drinker since...age 13 and am 20 now, my alcohol intake hasn't increased and I only experienced my first black out at 18, now they happen almost every time I drink no matter what the type of alcohol. I used to drink...
by Once had a life 13 years ago
I was diagnosed with severe PTSD in 1998 by DRs in Sydney Australia. I was told that I fit into the 2% category which do NOT usually survive. I must admit, this has been the wildest roller coaster ride that I've ever been on. Blackouts, "waking" as if from a nightmare,...
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