The phrase "a bit troubled by" is correct and usable in written English.
It can be used when expressing mild concern or discomfort about a particular issue or situation.
Example: "She seemed a bit troubled by the news of the layoffs at her company."
Alternatives: "somewhat concerned about" or "slightly uneasy with".
I am a bit troubled by the adjectives used to describe this enormously talented young woman.
I have occasionally been a bit troubled by those old Pathé newsreel clips of British sporting events in which, at climactic moments, the men in the crowd chuck their hats – flat caps and trilbys – in the air, and turn to clap one another on worsted and gabardined backs.
I'm also a bit troubled by the recent options-trading trends on the VIX itself.
Stockbrokers and research analysts calmly pad down carpeted hallways, looking not a bit troubled by the S&P 500′s 25% drop.
Watson told Golf.com that he bought Woods' suburban Orlando home that had been listed at $2.2 million -- and wasn't a bit troubled by the ghosts of Tiger's past.
Horn, board president of the Public Corp. for the Arts, said she was both pleased and a bit troubled by the council's decision to give the group a $30,000 grant.
And I feel that that's a precedence that I'm a little bit troubled by, even though they do cause vast misery to the people that they infect.
Severe sufferers were identified by responses of quite a bit troubled, very troubled, or extremely troubled on a seven point Likert scale (top three box).
Gay or straight, they didn't seem in the least bit troubled by the gayness.
He was catching his rival on the cards but Hopkins did not seem in the least bit troubled by the Welshman's power.
Mr. Bush does not seem the least bit troubled by the prospect of invoking unpleasant election symbols or injecting himself into a thorny labor dispute.
