We cry when we laugh because extreme laughing causes our face muscled to scrunch. This puts pressure on the tear ducts, thus squeezing out tears and making us cry. Another theory suggests that it may be due to a disorder called Pathological laughter and crying. It occurs due to brain injury or neurological disorder. This disorder causes people to uncontrollably laugh and cry. Now, since the same disorder produces tear as well as laughter, it suggests that the common area is responsible for crying as well as laughing. So, it may be noted that when we laugh uncontrollably, the common area confuses and mistakenly trigger our crying response also and thus producing tears.
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