Blocked ears are commonly caused by otitis externa, cerumen impaction, and cholesteatoma of the external auditory canal, which need to be unblocked by removing the cause of the disease, or removing the cerumen or cholesteatoma. 1. Otitis externa is an inflammatory disease caused by bacterial, viral and fungal infections of the skin of the external auditory canal, which leads to congestion, redness and swelling of the skin, as well as oozing of secretion, which accumulates in the ear canal and leads to blockage of the ear, etc. It is necessary to remove the secretion in the ear canal in time, which can be removed by suction with suction device, and then carry out anti-infection treatment for the external auditory canal. 2. Cerumen is the secretion produced by ceruminous glands in the skin of the external auditory canal, which accumulates in the ear canal and forms cerumen embolism, blocking the ear canal and causing symptoms such as ear stuffiness, tinnitus and hearing loss. The ear canal can be unblocked by softening the cerumen with sodium bicarbonate ear drops and then removing it with saline rinses. The medication must be applied under the guidance of a doctor. 3. Cholesteatoma of the external auditory canal, a cystic mass of keratinized flat epithelium and fibrous connective tissue wrapped around the external auditory canal, containing exfoliated epithelium and keratinized material. It is mainly treated by surgery. If there is no narrowing of the external auditory canal in the early stage and there is no obvious formation of a depression in the bony wall of the external auditory canal, the external auditory canal can be cleaned up under a microscope or an otoscope, the cholesteatoma can be removed and the external auditory canal can be unblocked. If any of the above conditions are present, a hospital visit is required for a definitive diagnosis and treatment.