There are tears in your eyes all the time, even when you're not crying. They wash your eyes constantly, bathing them in a salty fluid made by the tear glands. Normally, there is so little fluid that it drains off into two small tubes near your eyes and then into your nose. But, if you get hurt or are upset by something, your tear glands make so much salty fluid that it can't all flow into the tubes - now you are crying! - bigsiteofamazingfacts.com; gibbsmagazine.com; answerbag.com

There are tears in your eyes all the time, even when you're not crying. They wash your eyes constantly, bathing them in a salty fluid made by the tear glands. Normally, there is so little fluid that it drains off into two small tubes near your eyes and then into your nose. But, if you get hurt or are upset by something, your tear glands make so much salty fluid that it can't all flow into the tubes - now you are crying! - bigsiteofamazingfacts.com; gibbsmagazine.com; answerbag.com