Frequently itchy ears may be caused by atopic dermatitis, chronic granulomatous tympanitis, chronic diffuse otitis externa and other diseases. 1. Atopic dermatitis: this disease is mainly caused by contact with allergens, such as animal dander, pollen, metal, seafood, milk, etc., so the patient’s ears will appear itching, stinging, redness and swelling and other symptoms. 2. Eczema of the outer ear: Eczema of the outer ear refers to the polymorphic rash that occurs on the skin of the auricle, external auditory canal and its surroundings. The etiology and pathogenesis are still not very clear, and may be related to allergic reactions, mental factors, neurological dysfunction, endocrine disorders, metabolic disorders, dyspepsia and so on. There is often skin redness, swelling, blistering and oozing, and local itching and burning sensation. 3. Chronic diffuse otitis externa: the disease is evolved from acute otitis externa, and the systemic resistance to decline, ear canal skin damage, wearing earphones for a long time, dirty water into the ear, as well as the temperature rises, humidity increases and other factors. It can be characterized by itching and discomfort in the ear, thickening of the skin of the external auditory canal and narrowing of the canal. When the ear is often itchy, the patient can go to the hospital to improve the systematic examination to clarify the specific causes.