Suddenly feeling stuffy ears with blocked sensation may be caused by cerumen embolism, upper respiratory tract infection, otitis externa, idiopathic deafness and other factors. 1. Cerumen embolism: the cerumen produced is not cleared in time, and with the activities of the body, it may collide with the wall of the ear canal, thus producing the uncomfortable feeling of stuffy ears and tinnitus, etc. If the amount of cerumen is large, completely blocking the external ear canal, it may cause the feeling of blockage in the ear as well as the decrease of hearing. 2. Upper respiratory tract infection: after inflammation in the upper respiratory tract, the throat may become obviously congested and edematous, and may also cause swelling of the eustachian tube, which may lead to ear stuffiness and a feeling that the ear is blocked. 3. Otitis externa: after the disease, the local inflammatory stimulation may lead to tympanic membrane congestion and edema, which may lead to the patient’s ear stuffiness, feeling that the ear is blocked symptoms. 4. Sudden deafness: referred to as sudden deafness, refers to the sudden and unexplained sensorineural hearing loss. The main manifestations are sudden onset of hearing loss, tinnitus, ear stuffiness, dizziness, auditory hypersensitivity, anxiety and so on. In addition, cholesteatoma of the external auditory canal, secretory otitis media, etc. may also lead to ear stuffiness and the feeling of blocked ears. It is recommended that the patient consult a doctor in time to find out the cause of the disease and then treat it actively, so as not to delay the condition.