I have always been impossibly intrigued by the psychology behind tears, and why we cry.
It is always a huge relief to cry, I always feel lighter and brighter when I have finished howling. It turns out that there is a hormone that is produced in our tears, our emotional tears, that reduces stress. Crying really does relieve some of your pain, it is true that whilst you may feel drained after crying, you also feel a tiny bit better.