addie2629 said...
...or could be dry eye syndrome resulting from crying....
Dry eye syndrome is caused by abnormal tear production or composition. If someone already had dry eye syndrome then crying might exacerbate the symptoms but it would not be the cause.
But you're right that it could be something... simpler (though Keratoconjunctivitis sicca certainly warrants a trip to the doctor). I only mentioned the possibility of a more serious problem in the spirit of being "better safe than sorry."
Ben