When excessive secretion of earwax occurs in the ear, or when its elimination is obstructed, it can accumulate too much in the external ear canal and eventually condense into a black, hard mass that blocks the external ear canal, which is still mainly cerumen embolism. When it appears, a small amount of cerumen is not clinically symptomatic, but when there is more, it may cause inflammation of the external ear canal and even swell after encountering water, leading to symptoms of hearing loss and ear pain. Therefore, when black earwax appears, consider using 6% sodium bicarbonate injection to soften the earwax and then go to an ENT department to suck it out with an aspirator or flush it out with saline.