Mainly this happen because of high tension and lot more tension taking extrme thinking of high burrden on yourself this are the main reason.
In todays grneration people mainly takes to much tension of their life and many more things.
Such problmes mainly damaged the our working style.Taking more tension is not good for the life.
High burrden of work on the daily bases cause this problem mainly.Work daily 10 hours only and give proper rest to the body.
Some of the students also get this problem because of higher exam tension.so do not take more tension in life.