Just worrying probably wouldn't, but excessive, constant worrying might. Excessive worrying makes my mind come up with some crazy, irrational thoughts. I do not have paranoia, but I can see where that could easily be the next step.

As a mild example, the other day I thought I ticked off my T. I made some comment via email that I thought may have wound up coming out wrong. So for hours, I sat around worrying about what I had wrote and how my T is going to respond negatively to it. I finally came to the conclusion that my T is going to hate me when she reads the email, and she will probably wind up dropping me like a hot potato (so, maybe I do have paranoia!).

Turns out, my T didn't take my comment wrong at all. Even if she had, I know she would never hate me or drop me as a client because of it. When I worry excessively, my mind becomes my worst enemy and becomes quite a trickster. For me, I see excessive worrying leading the way to paranoia on some level as a good possibility.