Eczema of the external ear canal, chronic suppurative otitis media, cholesteatoma of the middle ear and cancer of the middle ear may be the causes. 1. Eczema of the external auditory canal: it causes localized moist and itchy ears and secretions, so it feels like water is always flowing out. 2. Chronic suppurative otitis media: Infection in the middle ear triggers suppurative otitis media, so there is purulent secretion flow, accompanied by ear pain, hearing loss, tinnitus and other symptoms. 3. Cholesteatoma of middle ear: secondary cholesteatoma of middle ear manifests itself as long-term pus flow in the ear and foul smell. 4. Middle ear cancer: because of the erosion and ulceration of the cancerous tumor, it causes the ear to flow and have a bad smell. There may be other reasons for water flowing out of the ear. It is recommended to consult a doctor in time and find out the cause of the disease as soon as possible, so as not to miss the condition.