Why eyes burn when i cry?

Your tears have salt in them. Sometimes the salt content is higher if you have not been drinking enough water.

If one has an infection in the eyes tears can cause burning.

If one has mascara or some type of makeup that gets into the eye when tearing that could burn.

Eyes Burning When Crying

Well when you cry the tears have salt in them, and it causes irritation for your eyes. So thats basically it, or it could be that you cried really hard, and that your eyes burn from the salt, and pressure of your hands rubbing at your eyes. But yes, it burns mainly because of the natural salt in your tears

I have that problem too. The most likely culprit for you pain is dry eye syndrome (DES).  Typical sypmtoms associated with DES are burning, dryness, feeling like there is something constantly in your eye, and watery eyes.  DES is often exacerbated by smoke, wind, heat, low humidity, computer use, or when crying.  There are several treatment options for DES, from over the counter medication to prescription medication.  You should go see your optometrist as soon as possible to confirm the diagnosis and begin treatment.  If left untreated, DES usually gets much worse and the pain can become constant."

From the natural salt on your skin

its probably an infection in your tear ducts i reccomend you go to a doctor as soon as possble