Feeling blocked inside the ear may be caused by cerumen blockage of the external ear canal, secretory otitis media, sudden deafness, and Eustachian tube disorder. 1. Cerumen blockage in the external ear canal: Excessive cerumen in the ear canal may cause the ear to feel blocked after water enters the ear during hair washing and bathing, resulting in cerumen expansion. 2. Secretory otitis media: It may be related to bacterial infection, and there will be fluid in the middle ear at the onset of the disease, which will make you feel that your ears are blocked, and it may be accompanied by hearing loss, tinnitus and other symptoms. 3. Sudden deafness: may be related to the inner ear blood supply obstacle, membrane labyrinth accumulation of water and other factors, triggering sudden deafness, it will lead to ear stuffiness and ear blockage, similar to the feeling of blocking cotton, may also be accompanied by dizziness, tinnitus, nausea, vomiting and other symptoms. 4. Eustachian tube disorders: including air pressure-induced dysfunction of the eustachian tube, abnormal opening of the eustachian tube, delayed opening, etc., mainly manifested as a sense of ear fullness, ear pain, tinnitus, hearing loss. Feeling blocked inside the ear may also have other reasons, and accompanied by other obvious discomfort, may be the existence of disease factors, should also promptly consult a doctor for examination and treatment.