Clairaudience is being able to hear what isn't physically possible. Most of the time this will manifest as thoughts in your head. You know when you read in your head, Clairaudience will come across like that. Sometimes it can manifest as if someone is calling your name or talking to you.
Once you mention hearing voices, some people seem to panic, and think they are going mad. There is a simple way to know if the thoughts/words are coming from beings of light, or if its your ego or something negative. If the thoughts seem positive and and full of love, or are warnings that keep you safe, then its guidance. If the thoughts tell you to harm yourself/others, or tell you to do things that are dangerous, then yeah get checked out.
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nam-myoho-renge-kyo - a mantra for wealth/abundance