Whenever I yawn, tears come out of my eyes. Why?!
Question: Whenever I yawn, tears come out of my eyes. Why?
Answers:
When you yawn, you stretch the glands, channels, and punctum. Closing the punctum cause an overflow of tears, which will then roll down your cheeks. Squeezing the channels can squirt out all the fluid to the eyes, like too much mustard on a hot dog. Closing your eyes tightly can squeeze the tears already on the eye. This combination can produce tears when you yawn.
http://www.healthexpertadvice.org/forum/Optical/Why-do-my-eye-tears-everytime-i-yawn-202600.htm