Blood in the ear but no pain, the most common for the outer ear canal skin damage, may also be the tympanic membrane trauma or chronic suppurative otitis media and other causes. 1. External ear canal skin injury: If you use sharp tools or violent ear pulling, you may accidentally damage the ear canal, at this time there is blood in the ear, generally less bleeding, there will be no obvious pain, keep the local clean can, can stop bleeding on their own. 2. Tympanic membrane trauma: If the tympanic membrane rupture, hearing damage is light, there will be a small amount of bleeding, resulting in blood in the ear but not painful phenomenon. 3. Chronic suppurative otitis media: it is a chronic suppurative inflammation of the mucous membrane, ossicles or deep bone of the middle ear, which will lead to mucous membrane congestion, thickening, etc., and repeated pus with blood and hearing loss, which will lead to the phenomenon of blood in the ear but no pain. The appearance of blood in the ear, generally also recommended to come to the hospital in time to identify the cause of active treatment, so as not to delay the condition.