It happens when you take too much load on body and the body isn't conditioned.
I never actually threw up, but have seen guys/gals do it. Also, I have felt a little faint sometimes after a "hard" session.
The only advice here is:
Increase load gradually.
Take balanced nutritious diet.
Take good sleep.
Avoid substances like alcohol, tobacco, etc.
(Some trainers say you must also avoid all sexual activity during periods of training, but that's upto you).
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