I don't think one necessitates the other. I do not equate racing thoughts with hearing voices.

I think we all have an inner voice. This voice often critiques us and can be quite harsh. It tells us we might not look okay dressed a certain way or wonder what will people think of us and so on. My understanding is that this is perfectly normal but it is when this voice takes over that things become alarming. I think so too that hearing voices entails hearing voices other than our own.

Another example of a racing thought would occur maybe when we are super anxious about something. In my own case that would be staying awake all night worrying about how the next day at work is going to turn out. My mind runs incessantly through the various troubles that might arise and the ramifications of them. These are the sort of racing thoughts I experience.

Can you tell us examples of the sort of thoughts you experience that concern you?