Used to introduce something that is causing mild but persistent worry or annoyance.
“What's bothering me is that we still don't have a backup plan.”
“What's bothering me is how quiet he's been about the delay.”
This more informal, conversational phrase fits the casual tone often used between two speakers solving a problem together in Listening Part 1. It usually introduces a personal concern rather than a hard fact, so listen for the reason that follows to understand the speaker's real hesitation.
Synonyms: what worries me is, what concerns me is, what's nagging at me is