concern
Preoccupazione is the Italian word for concern. It is used to express worry or anxiety about a particular situation or issue. For example, one might say 'Ho una grande preoccupazione per il futuro del nostro pianeta' to express concern about the future of our planet.
Worrying about the future keeps me awake at night.
This sentence suggests that the speaker is anxious about what is to come, causing them insomnia.
Without worry, life would be monotonous.
In this sentence, the speaker is implying that concern or worry, although usually considered a negative thing, can add variety and interest to life.
Your constant worry about details is beginning to become annoying.
Here, the speaker is expressing annoyance with someone else's obsession or anxiety over small details, suggesting that they should relax or worry less.