What causes sudden deafness in general?

There are many reasons for sudden deafness, mainly as follows: 1, virus infection, ear nerve injury, and insufficient blood supply to the ear; 2, drinking too much, making blood vessels spasm; 3. Excessive mood swings or staying up late will reduce blood supply; 4. Seasonal changes, especially in the north, the temperature difference is obvious, and blood vessels contract to form spasms; Noise is also an important cause of sudden deafness.