Hidden pain in the left ear can be seen in left cerumen embolism, left chronic otitis externa, left chronic suppurative otitis media and other diseases. 1. Left cerumen embolism: cerumen is commonly known as earwax, cerumen embolism in the external auditory canal of the left ear, if the cerumen is relatively large, it can cause pressure on the wall of the external auditory canal, causing local pain. 2. Chronic otitis externa on the left side: the typical symptoms of chronic inflammation of the skin of the external auditory canal are vague pain and itching inside the ear, accompanied by flaking, crusting and thickening of the skin of the external auditory canal. 3. Chronic otitis media on the left side: chronic otitis media can lead to perforation of the eardrum, inflammatory reaction within the tympanic cavity, accumulation of pus overflowing into the external auditory canal, and collection of purulent secretions in the external auditory canal, which can cause ear pain, hearing loss, tinnitus, etc., and may be accompanied by headache. It is recommended that the patient seek medical treatment in time, and systematic examination to clarify the diagnosis.