Hardship
Illness or injury.
Death.
School transfer 
Divorce.
problem
Someone transfers school the child will feel unhappy because you made a lot of friends and. The school he goes to is a school with a lot of bullies and that can create depression and suicide.
problem
problem Link Title
2 married people are not happy with each other there kids will not happy with that. And the child has to pick the mom or the dad to stay with.
hospital bills
cant walk
depression
depression
cant breath
If someone cant see because of a injury someone can bully him or her and it can make someone really sad
If somones love once died it can make a lot of people depressed and unhappy because they like the person a lot.
Someone love once died and some people love them so much they commit sucide.
Someones realtives dies and you have to pay the bills and someone does not have money and it can make unhaooy and it can ruin your life.
It can create money bills because the school might be so expensive.
suicide