What about crying from pain or nausea? I know from my own experience that when I put my finger at the back of my throat because of nausea, not only do I throw up but I also produce a lot of tears which blur my vision until I blink. I have also cried from pain when it was really strong. But when I cry from pain the tears move down my face relatively quickly and when I cry from nausea the tears stay suspended until I blink. Why is this?