Old ear itching may be chronic diffuse otitis externa, external ear eczema and other diseases. 1. Chronic diffuse otitis externa: the occurrence of this disease is related to the decrease of the resistance of the skin of the external auditory canal, coupled with pathogenic microbial infections after the damage of the skin of the ear canal, and is related to the factors such as the entry of dirty water into the ear canal and the damage of foreign objects. The patient’s ear will appear edema, redness, flaking, itching and other symptoms. 2. Eczema of the outer ear: this disease is mainly caused by contact with allergens, such as earrings, animal dander, pollen, irritating chemicals, milk, cosmetics and so on. The common symptoms are mainly itching and flaking, which may be accompanied by secretion and pain. 3. Other: clinically also need to consider is chronic granulomatous tympanitis, contact dermatitis and other diseases. It is recommended that patients who always feel itchy ears go to the hospital to improve the relevant examination to clarify the specific causes.