Worries or cares; matters that cause anxiety or concern—commonly used in everyday Japanese.
最近、仕事のことで心配事が多い。
Lately I have a lot of worries about work.
心配事を友達に打ち明けたら、気持ちが楽になった。
When I confided my worries to a friend, I felt relieved.
親の病気が私の最大の心配事だ。
My parents' illness is my biggest worry.
夜になると余計に心配事を考えて眠れない。
At night I think about my worries even more and can't sleep.