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Sometimes when I laugh very hard, I get a headache. Sometimes it can be a very big headache if I was laughing hard for a while. Is this normal?
Yes, definitely normal, not really anything to worry about as long as you're young and reasonably healthy (no heart disease, etc). Laughter is basically hyperventilating coupled with the sounds of laughter produced by your vocal chords; this can actually result in not getting enough oxygen, and consequently a headache. It's not something to worry about, though, unless you have heart or lung disease (asthma, etc) or other illnesses where exertion or shortness of breath can pose serious danger.