The constant ringing in the ears of tinnitus is a severe nuisance to its sufferers. But some hope may be ahead. According to a mouse study by scientists in the U.S. and China, the neurotransmitter serotonin, best known for its role in regulating mood, may also influence the severity of tinnitus, new research has found. Read more from @ScienceAlert@flipboard.com: https://flip.it/DZB7DX #Science #Health #Humans #Tinnitus