Serotonin is best known as your body’s “feel-good” chemical. It’s a chemical messenger that helps regulate mood, sleep, appetite and other important functions. That’s why many common antidepressants are designed to increase serotonin’s availability in the brain. Selective serotonin reuptake inhibitors — better known as SSRIs — work by blocking the brain from reabsorbing serotonin too quickly, leaving more of it available to help nerve cells communicate. But for some people, medications that boost serotonin may come with an unexpected problem: louder ringing, buzzing, hissing or roaring in the ears. That condition is tinnitus — the perception of sound when…

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