what is bugging you 什么事使你心烦；你有什麽别扭事儿

【例句】
What's bugging you? There's nothing to worry about.
你在烦什么？没什么好担心的。

That's why you look so concerned. What's bugging you?
怪不得你看起来那么忧虑。什么事使你心烦？