The body responses to extreme physical pain (and on other certain occasions) by producing .................................... Endorphins.
These Endorphins provides a feeling of well-being.
Pinch you hand really hard, let it go. What do you feel? Initially pain yes but it is followed by a feeling of a good feeling. That is the effect of endorphins if I am not mistaken.
Will it be correct to assume that psychological stress/pain produces a similar chemical like endorphins when under stress? Summons doctor @bologna.
If it is so we can assume that a person who is going through stress quickly produces that-chemical-I-do-not-know-of than in other people because the body is ready for it. Since this chemical makes one feels good the body (or maybe the subconscious mind) craves for it.
The mind craves to be depressed not because it desires depression because it desires the feeling that-chemical-I-do-not-know-of produces.