According to The New York Times, a new scholarly review from a British medical journal warns of the many harmful side-effects laughter can cause, including killing you.
Among the alarms it sounds: The force of laughing can dislocate jaws, prompt asthma attacks, cause headaches, make hernias protrude. It can provoke cardiac arrhythmia, syncope or even emphysema (this last, according to a clinical lecturer in 1892).
Laughter can trigger the rare but possibly grievous Pilgaard-Dahl and Boerhaaves syndromes (see explanation below).
And ponder, briefly, the mortifying impact of sustained laughter on the urinary tract (detailed in a 1982 The Lancet paper entitled Giggle Incontinence).
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