Our tears contain natural pain killers to help us cope.

8 Reasons Why We Cry

Why do kids cry so much? The science behind sobbing - Today's Parent

4 Types of Eye Drops and How to Safely Put Them In

New Research May Explain Unexpected Effects of Common Painkillers Including Ibuprofen and Aspirin

The Benefits of Crying and Why It's Good for Your Health - CNET

Happy Tears: There's Probably a Good Reason for Them

9 Ways to Cope with Emotional Pain

What's the Point of Crying?: The Benefits of Tears for Mental and Physical Well Being - Take Root Therapy

Understanding and Working with the Window of Tolerance - ATTACHMENT AND TRAUMA TREATMENT CENTRE FOR HEALING (ATTCH)

Preservative-Free Eye Drops

How Crying Could Actually Boost Your Mood