A heavy sound in the ear may be caused by conditions such as abnormal opening of the Eustachian tube, abnormal function of the Eustachian tube, and secretory otitis media. 1. Abnormal opening of the Eustachian tube: soft tissue defects, scar adhesions, atrophy and muscle paralysis around the pharyngeal opening of the Eustachian tube; or mental factors leading to muscle contraction. The Eustachian tube opens abnormally, which leads to over-hearing and the feeling of speaking with a heavy voice. 2. Abnormal function of the Eustachian tube: mostly caused by rhinitis and sinusitis, the Eustachian tube is blocked, resulting in negative pressure in the middle ear, which leads to the self-hearing of the ear with a heavy voice when speaking. 3. Secretory otitis media: Eustachian tube dysfunction can cause continuous negative pressure in the middle ear, resulting in fluid accumulation in the tympanic chamber, tinnitus, and the phenomenon of speaking with a heavy voice. It is recommended to go to the hospital in time for diagnosis and standardized treatment.