Tinnitus is a common disease, and it is estimated that there are at least 100 million tinnitus sufferers in China. Many people take a laissez-faire attitude towards tinnitus, thinking that it will heal itself just like a cold, which is not desirable. Many people think that nasopharyngeal cancer always grows in the nasopharynx, so what does it have to do with the ear? In fact, they are closely related. Between the nasopharynx and middle ear cavity, there are two connected tubes called eustachian tube, and nasopharyngeal cancer often occurs near the opening of eustachian tube. Patients often experience tinnitus, a feeling of stuffiness and blockage in the ear, and hearing loss, but they feel loud when they hear themselves speak. About half of the patients with nasopharyngeal cancer have tinnitus, which is often a low-frequency buzzing sound. Therefore, once the above symptoms appear, especially for men who are frequent smokers, they should be highly alert to the possibility of nasopharyngeal cancer. Sudden deafness, also known as sudden hearing loss, is a spontaneous, sudden, and often rapid neurological hearing loss in one ear, often accompanied by tinnitus, which is predominantly high pitched. The cause of this disease is unknown and may be related to cold, heat, fatigue, allergies or viral infections such as influenza, mumps or herpes zoster, etc. The blood circulation and material metabolism of the inner ear becomes impaired and the blood supply is inadequate, resulting in hearing loss. In addition, the formation of blood clots can aggravate the obstruction of blood circulation in the inner ear, so patients with atherosclerosis must be alert and go to the hospital for a comprehensive examination in a timely manner once they have tinnitus to prevent the problem from happening. Auditory neuroma is a tumor arising from a lesion of the sheath cells of the auditory nerve, accounting for 7%-12% of intracranial tumors, and is the most common type of intracranial neuroma. In its early stage, due to the compression of the auditory nerve by the tumor, unilateral tinnitus often occurs, and it is a high-pitched cicada or siren sound. It starts as paroxysmal and progresses to persistent, with progressive hearing loss or even deafness. Since the auditory nerve in the inner ear canal is accompanied by the facial and vestibular nerves, it is likely that the tumor will also compress them and cause symptoms such as facial numbness, facial palsy and vertigo. Most auditory neuromas are benign tumors and are treated by surgical excision. Tinnitus may be a precursor of coronary heart disease. Some patients with cardiovascular disease may be accompanied by bilateral, high-pitched tinnitus. This is because the cochlea is sensitive to blood volume and oxygen content. In the early stages of cardiovascular disease, the blood flow to the brain and the oxygen content of the blood are reduced, which makes the microvascular dynamics of the cochlea abnormal and eventually leads to tinnitus. According to statistics, among cardiac patients with tinnitus, 86.7% have tinnitus before angina, and 8.6% have angina and tinnitus at the same time. Therefore, all cardiovascular patients, especially middle-aged and elderly patients, should go to the hospital for cardiovascular system examination once they have persistent tinnitus. Improper use of drugs can cause drug poisoning, and one of the symptoms of poisoning may be tinnitus. This is because some drugs damage the nerves in the inner ear. For example, high doses of quinine, quinidine, chloroquine and other drugs can cause severe tinnitus, but it will gradually improve after stopping the drug, and most of them will not affect the hearing. In contrast, high doses of gentamicin, streptomycin, kanamycin and other drugs can be very damaging to the auditory nerve and vestibular nerve, and if the drugs are not stopped in time, deafness can develop rapidly and be difficult to recover. High work pressure and emotional tension is an important cause of tinnitus. Menopause, the intense work of white-collar workers, the intense study of students, and the late sleep of middle-aged and elderly people playing mahjong at night can cause tinnitus, which can be improved or disappeared through medication and regulation of emotions and changes in living habits. Degeneration of inner ear cell function in old age is also a common cause of tinnitus.