According to Tom Lutz who wrote "Crying: The
Natural and Cultural History of Tears", there are
some studies that show hormone release (which
might be occurring to the sensation of pain or due
to depression/anxiety) cause the release of tears.
There are actually several "types" of tears: one
are everyday tears that keep your eyes moist,
another are reflexive/irritant tears (like those
that are released when you cut an onion or get
poked in the eye), and then there are emotional
tears. These emotional tears actually contain
hormones, so it may be that this is a way of the
body to release the hormones that are making you
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