Sadness is the part of every one's life . Sadness is the silent cry of many peoples.

Without sadness life is incomplete. Some peoples express his sadness in his dairy or in the form of poetry.
Ups and downs are the part of life do not trust to anyone , because now a days no one is loyal and trusted.
Every one works for the sake of his/her own benefit.

Peoples used the person and when they feed you with that's then kick off, and said sorry its so , some peoples sadness in their life because of less income , food , health , shelter etc.

Reasons of sadness

There are many reasons of sadness
Behavior
Less income
Shelter
Food
Health
Unemployment