Water coming out of the ear may be caused by water in the ear, purulent otitis media, oily cerumen, cerebrospinal fluid ear leakage and other factors. 1. Water in the ear: water in the ear during bathing, after bathing will lead to water coming out of the ear, which is a normal physiological phenomenon and usually has no other clinical manifestations. 2. Suppurative otitis media: usually refers to pus flowing out of the ear, is the main manifestation of suppurative inflammation, associated with a variety of diseases, such as acute suppurative otitis media, chronic suppurative otitis media (active stage). 3. Oily cerumen: some patients may show oily cerumen, usually light yellow or yellowish brown, due to genetic or endocrine disorders. In the case of excessive secretion, it may appear as running water in the ear and usually has no foul odor. 4. Cerebrospinal fluid ear leakage: it is a slow flow of clear watery fluid from the ear, which may be accompanied by a small amount of fluid. It is a characteristic of cerebrospinal fluid leakage and is usually associated with cranio-cerebral trauma, skull base fracture, rupture of the tympanic membrane and other factors. Water flowing from the ear, excluding physiological factors, and accompanied by other obvious abnormalities, it is recommended to consult a doctor in a timely manner to clarify the diagnosis and standardize the diagnosis and treatment, so as to avoid delaying the condition.