Tinnitus on one side may be caused by neurotinnitus, acute otitis media, otitis externa, cerumen embolism and so on. 1. Neurogenic tinnitus: tinnitus on one side may be caused by neurogenic tinnitus, which is usually related to neuropathy caused by bacterial and viral infections and autoimmune factors, etc. Untreated, it may lead to hearing loss and affect normal life. 2. Acute otitis media: acute infection by bacteria such as Streptococcus pneumoniae, Streptococcus b hemolyticus, Staphylococcus, Streptococcus pneumoniae and so on will lead to tinnitus on one side of the ear, accompanied by earache, hearing loss, and some patients will have diarrhea, cold and other symptoms. 3. Otitis externa: when the resistance of the skin of the external auditory canal decreases or is damaged, microorganisms enter and cause infections, resulting in tinnitus on one side, accompanied by oedema of the skin of the external auditory canal, accompanied by itching, and severe hearing loss. 4. Cerumen impaction: If cerumen secretion is excessive, poor discharge and other factors cause the disease, it will lead to tinnitus on one side, accompanied by ear pain, ear occlusion and other symptoms. It is recommended to go to the regular hospital in time, under the doctor’s diagnosis, actively cooperate with the treatment, and pay attention to keep the external ear canal clean in life to avoid infection.