For general concern:
* Pag-aalala (pronounced pag-ah-la-la) - This is the most common and general term for concern. It implies worry or anxiety about something.
For concern about someone's well-being:
* Kabalaka (pronounced ka-ba-la-ka) - This term implies worry or anxiety about someone's health, safety, or well-being.
For concern about a specific issue or problem:
* Pagaalala (pronounced pag-ah-la-la) - This term is the same as the first one but emphasizes a specific issue or problem that is causing worry.
For concern in the sense of caring about something:
* Pagmamalasakit (pronounced pag-ma-ma-la-sa-kit) - This term implies care, affection, and responsibility towards someone or something.
Other words that can be used depending on the context:
* Pag-iisip (pronounced pag-ee-sip) - This implies thinking about something deeply or worrying about it.
* Pag-aalaga (pronounced pag-ah-la-ga) - This implies taking care of something or someone.
The best word to use will depend on the specific context and the nuance you want to convey.