Constant itching in the ear may be caused by diseases such as external auditory canal eczema, external auditory canal fungal disease, chronic otitis externa. 1. Eczema of the external auditory canal: allergic inflammation of the auricle, external auditory canal and its surrounding skin. It is mainly characterized by itching and polymorphic rash, which is easy to recur. 2. Otitis externa fungal disease: fungal infectious disease of the external auditory canal. Generally, there are itching and stuffiness in the ear, sometimes itchy, and it is worse at night. 3. Chronic otitis externa: water in the external auditory canal, purulent otitis media stimulation can lead to otitis externa, chronic otitis externa itchy external auditory canal, a small amount of exudate. Itchy external auditory canal should go to the hospital in time, after diagnosis and treatment.