The causes of deafness are complex, usually caused by infectious factors, genetic factors, drug factors, tumor diseases, trauma, immune diseases, blood supply disorders and other reasons. 1. Infectious factors: If the patient suffers from infectious diseases such as meningitis or otitis media, the patient’s hearing system may be damaged, causing deafness. 2. Genetic factors: If the patient is born with chromosomal abnormalities or genetic mutations, it will cause changes in the genetic material, which will easily cause congenital deafness if the patient has hearing lesions. 3. Drug factors: for the use of ototoxic drugs, such as aminoglycosides (streptomycin, neomycin, etc.), can also cause deafness. 4.Tumor disease:When the patient has a tumor in the ear canal, it may cause the cochlear nerve to be compressed or lost, which is also one of the causes of deafness. 5. Trauma:If the patient does not pay attention to protection, resulting in head injury or temporal bone fracture, etc., it may cause deafness. 6. Immune diseases: If patients with rheumatoid arthritis, systemic lupus erythematosus, autoimmune inner ear disease and other diseases, such as lesions involving the inner ear, deafness can occur. 7. Blood supply disorders: hypertension, hyperlipidemia and other patients, due to vascular disease, which affects the oxygen exchange in the inner ear, causing metabolic disorders and symptoms of deafness. It is important to note that if the patient has symptoms of deafness, he should go to the hospital as soon as possible to find out the cause of the disease, and actively treat it, so as not to delay the condition.