Earwax is also called cerumen. Cerumen grows too fast and can be caused by heredity, fungal infections of the ear canal, and structural abnormalities of the external ear canal. Any ear canal discomfort must be treated in a regular medical institution. 1. Some people may have excessive oil secretion in the external ear canal due to hereditary factors, resulting in the formation of oily cerumen. Excessive cerumen blockage of the ear canal may lead to tinnitus, stuffy ears, and so on. 2. Fungal infection occurs in the ear canal, and there will be fungal secretions blocking the ear canal. As a result, the cerumen in the ear canal cannot be discharged, which will make people feel that the ear is overgrown with cerumen. 3. Abnormalities in the structure of the external auditory canal usually refer to malformations of the external ear, etc., which will prevent the cerumen from being discharged on its own. Malformed structures of the external ear are also prone to acute otitis externa, and the inflammation will stimulate the skin of the ear leading to an increase in secretion and the appearance of excessive cerumen.