Crying

What is crying? What physically causes us to cry?
Tears of emotion are produced from the main lacrimal gland. Basal tears are
produced continuously; about 5-10 oz. either drain into the puncta or
evaporate everyday. After the puncta the tears flow into the canalis ducts
and then into the lacrimal sac and finally into the nasolacrimal duct, which
then empties into the nose. When tears are the emotional type and are
abundant the puncta cannot accommodate the abundance of liquid, so they flow
out of the eyelids. (Academic.evergreen.edu)

How do you feel when you cry?
We usually are sad or very happy when we cry, although we can cry when we are physically in pain as well

Is crying healthy?
Crying may not be a blockbuster drug, but the latest research suggests it's highly effective at healing, and that it improves the mood of 88.8 per cent of weepers, with only 8.4 per cent feeling worse. (alternet.org)
How often does an adult cry?
The average American adult cries for five minutes 3-4 times a month (academic.evergreen.edu)

How often does a child cry?
The average infant cries 30 minutes to 2 hours a day (academic.evergreen.edu)