We shed tears when we cry because the tears are the body's way of reducing the toxins that build up when stress levels rise. The chemical composition of tears will thus vary depending on their function.
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why do tears come out of our eyes when we cry
When you cry, tears are produced in the tear glands, or lacrimal glands, found way up under your upper eyelids. One theory as to why we cry is that it nonverbally expresses distress and elicits help from others.