Used to faint at least once a year throughout childhood until 30s/40s. Never found out reason really. Would work out eventually a knowing tummy ache that would precede it. Doctor used to say I had low blood pressure. Now for first time in life I seem to always have high blood pressure.
A few times. Once when arriving at school on a cold snowy day, I sat on a radiator and fell off in a faint.
Another, in a swimming pool on holiday I felt faint, panicked and had to be pulled out of the pool by two men.
I fainted in some interesting places when I was younger. The officers mess at the local RAF base, foyer of a posh hotel in Tunisia, Nairobi airport, the Blue Mosque in Instanbul. First time I did it was at the bus stop and cracked my head so loudly on the pavement that someone called an ambulance and I had to spend the night in hospital with concussion. It was always just put down to low blood pressure. I don't have low blood pressure anymore and I haven't fainted for years.
once, after bending down to pick something from the bottom shelf at a supermarket, I suddenly found myself on my back looking at the ceiling. I probably wasn't out for more than a second. It was in Denver, mile-high city, so everyone just said it must have been the altitude. I don't know if that was a real diagnosis or just explaining it away - I never had any other trouble there.