Narrowing of the ear canal is commonly caused by otitis externa, cholesteatoma of the external auditory canal, cerumen impaction of the external auditory canal, and congenital developmental anomalies, etc. Timely consultation and diagnosis are needed. 1. Otitis externa: This refers to the diffuse inflammation of the skin of the external auditory canal caused by bacterial or other microbial infections, which may lead to edema and pain of the skin of the external auditory canal, resulting in narrowing of the ear canal. 2. Cholesteatoma of the external auditory canal: It is mainly caused by the accumulation of basal cells after the damage or inflammation of the skin of the external auditory canal, which results in the formation of cholesteatoma of the external auditory canal. Cholesteatoma of the external auditory canal can block the area of the external auditory canal, which leads to narrowing of the external auditory canal and affects the hearing and other functions. 3. Cerumen impaction of the external auditory canal: when there is a large amount of cerumen in the external auditory canal, occupying the external auditory canal, which can lead to physiological narrowing of the external auditory canal, usually it is only necessary to remove the cerumen impaction in time, and the normal structure of the external auditory canal can be restored. 4. Congenital developmental abnormality: If the patient is born with narrowing of the ear canal, it is considered to be caused by congenital developmental abnormality. Generally, the embryo in the developmental period, by viral infection, drug damage, which leads to developmental abnormalities, resulting in narrowing of the external auditory canal, ear deformity phenomenon. As there are many reasons for narrowing of the ear canal, it is recommended to consult a doctor in time to identify the cause of the disease and then target treatment.