Constant rumination just exacerbates it

from Vinnie Paz (Ft. Yes Alexander) – Is Happiness Just a Word? Lyrics on Rap Genius

Meaning

Rumination is defined as the compulsively focused attention on the symptoms of one’s distress, and on its possible causes and consequences, as opposed to its solutions

Exacerbate: to make (a bad situation, a problem, etc.) worse

So what he is trying to say here is that the constant focus on symptoms and so on just makes a bad situation worse.

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