The main causes of tinnitus in the left ear are the following: 1. The patient is exposed to particularly loud sounds that shock the hair cells of the inner ear, such as the stimulation of the eardrum by noise in bars and discotheques for a long time, which can lead to repeated vibrations of the eardrum and changes in the air pressure in the middle ear cavity, resulting in tinnitus in the ear, which can be improved by repeated rubbing and massage. 2. 3. Poor blood supply to the head or thrombus formation in the inner ear can also cause tinnitus, so it is important to actively identify the cause and treat it.