Laugh Yourself Silly: People have been known to get light-headed and even faint during a bout of hard laughing, especially if more air is going out than in--but it's not common,so if you faint at a mere giggle and not a guffaw,you might want to be examined.There are receptors in the neck and brain that respond to pressure and you may be causing too much from laughing.Those receptors affect heart rate and blood pressure
Answered 3/7/2016
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