The word "trouble" is used when there is a problem, large or small. This common word can be used as a noun, a verb, and as an adjective.
In these sentences and questions, the word "trouble" is a noun:
Who do you call when you are in trouble? (or…Whom do you call… )
Berniece is in big trouble at school.
The principal of a school or a dean of students usually deals with children who are in trouble.
Edith got in trouble for driving with an expired driver’s license.
How much trouble is she in?
Bob is having some trouble figuring out a problem at work. (have + trouble)
Pamela is having some trouble with her cable provider.
The troubles Kevin had with his neighbor began with a dog that wouldn’t stop barking. (Notice that the noun trouble can be used as a count noun or as a noncount noun.)
The trouble with the proposal to build a new stadum is that it’s too expensive.
If you have trouble starting your car, you might have to take it to a mechanic.
A person who has trouble breathing should see a doctor.
He’s in trouble.
You can also use the word "trouble" as a verb or as an adjective:
What’s troubling you? (trouble = verb)
This is a troubling development. (trouble = adjective)
Ralph’s depression troubled him so much that he needed to see a doctor. (trouble = verb)
Cindy is a troubled young woman who needs professional help. (trouble = adjective)
The word "troubleshoot" is used when referring to a method or a person who takes care of problems.
The company hired someone to troubleshoot the problems they were having with their computer network.
An owner’s manual for an electronic appliance usually includes a troubleshooting guide to help consumers figure out problems they may have with something they have purchased.