The ear is always itching and running water to consider chronic tympanitis, chronic suppurative otitis media, middle ear cancer, diffuse otitis externa and other factors. 1. Chronic tympanitis: discomfort or itching in the ear, recurrent pus flow as the main symptom, usually not accompanied by ear pain, no obvious hearing loss. A small amount of purulent secretion can be seen in otoscopic examination. (2) Chronic purulent otitis media: it is purulent inflammatory reaction of mucous membrane and periosteum of middle ear, which mainly manifests as repeated flow of mucopurulent secretion in the ear, hearing loss and tinnitus. 3. Middle ear cancer: it is most common in middle-aged and old-aged people, and is mostly squamous cell carcinoma. It often has long-term history of pus flow, recent bloody secretion and earache, and may have facial paralysis and difficulty in opening mouth. 4. Diffuse otitis externa: in acute stage, it manifests as ear pain, burning, small amount of secretion, accompanied by pulling pain of auricle and pressure pain of ear screen, diffuse redness and swelling of skin of external auditory canal, and secretion on the wall of external auditory canal. The ear is always itchy water may also exist other causes, such as symptoms suggest timely to go to the otorhinolaryngology doctor, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.