Tinnitus does not mean that there is no tinnitus when it is noisy, just the background sound of the noisy environment masks the tinnitus, and the tinnitus sound appears when it is quiet, common tinnitus may be neurotoxic tinnitus, there may be traumatic stress reaction or conductive tinnitus and so on. 1. Neurogenic tinnitus: refers to the state of no external sound source or stimulation, the ear subjectively abnormal sound sensation, such as mental stress, ototoxic drug intake and other reasons can cause the disease. 2. trauma: due to the body ear has been due to trauma and lead to local nerve, blood vessel and muscle damage occurring stress tinnitus symptoms, which may appear quiet tinnitus more prominent. 3. Conductive tinnitus: due to bacterial, viral and other pathogenic infections caused by inflammation of the area behind the eardrum, but also due to the inflammation will lead to fluid or pus accumulation in the middle ear cavity and other symptoms, which may induce the emergence of quiet tinnitus when the feeling of conductive tinnitus. There are many other causes of quiet tinnitus, it is recommended to actively seek medical attention to identify the cause of the disease and actively cooperate with the doctor to avoid blindly using their own medication.