Humans produce tears for a variety of reasons. Some of these have nothing to do with why
people cry. If you’re cutting up an onion or suffering from
seasonal allergies, your eyes may be brimming with tears. This is not emotional crying, but instead it is the act of the eyes producing tears to lubricate the eyes. In fact there are three types of tears:
basal,
reflex and
emotional, which all occur for different reasons.