Tinnitus is a sound that the human ear can hear on its own without external electrical or acoustic interference. If tinnitus occurs frequently, the following causes should be considered: 1. Infection: Acute and chronic infections can cause inflammation of the middle ear, which can cause tinnitus; 2. Medication: Ototoxic drugs can cause tinnitus in both ears after use; 3. Vascular or myogenic causes: Physiological tinnitus has a certain rhythm and pulsation, which can be consistent with heartbeat and pulse rhythm. Vascular tinnitus can appear as a rhythmic and pulsating tinnitus sound, which is caused by abnormal blood flow or vascular malformation. In addition, 10% of patients with auditory neuroma have unilateral tinnitus as their first symptom. 4. Neurogenic: Idiopathic tinnitus has no particular cause, but is mainly caused by neurodegenerative diseases, such as senile tinnitus, which has a 24% chance of occurring in elderly people over 60 years old and is caused by degenerative changes in hair cells or the auditory system. In addition, nervous tension and staying up late can cause tinnitus. Long-term consumption of carbonated beverages, strong tea, coffee, chocolate and other foods can also cause tinnitus.