Harvard conducts extensive research on tinnitus, a condition characterized by the perception of sound without an external source. They investigate causes such as damage to auditory cells, contributing factors like hypertension, and explore various treatment approaches, including Tinnitus Retraining Therapy (TRT), sound therapy, and neurostimulation techniques. Harvard also focuses on the impact of tinnitus on quality of life and seeks new advances to alleviate symptoms and improve overall patient well-being.