problem applies to a question or difficulty calling for a solution or causing concern.

PROBLEM meaning: 1. a situation, person, or thing that needs attention and needs to be dealt with or solved: 2. a…. Learn more.

PROBLEM meaning: 1 : something that is difficult to deal with something that is a source of trouble, worry, etc.; 2 : difficulty in understanding something

1. Difficult to deal with or control: a problem child. 2. Dealing with a moral or social problem: a problem play.

Problem definition: A question to be considered, solved, or answered.

6 days ago · Difficulty in accepting or understanding or refusal to accept or understand. You made your best honest effort; if they judge you harshly, that’s their problem, not yours. (climbing) A set of moves …

There are nine meanings listed in OED's entry for the noun problem, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.