Itchy ears during the day and at night are mostly due to vagus nerve excitation at night, due to the stimulation of the primary disease of the ear to reach the threshold of nerve sensitivity and itchy sensation. Common diseases that can cause itchy ears include: fungal disease of the external auditory canal, eczema of the external auditory canal, purulent otitis media and other causes. 1. Fungal disease of the external auditory canal: frequent use of antibiotic ear drops, ear digging, swimming, etc. may lead to fungal infections of the external auditory canal, which may manifest as itching, pain, hearing loss, tinnitus and other symptoms. 2. Eczema of the external auditory canal: due to allergic reactions, mental factors, neurological dysfunction, endocrine disorders, metabolic disorders, dyspepsia and other factors, usually manifested as itching of the external auditory canal, burning discomfort, increased secretion and other symptoms. 3. Purulent otitis media: mostly because of the upper respiratory tract infection from the Eustachian tube pathway spread to the middle ear onset, usually manifested as earache, tinnitus, pus, hearing loss and other symptoms, tympanic membrane perforation of the pus from the external auditory canal to stimulate the ear canal nerves can be itchy. The ear does not itch during the day and night itch for many reasons, if the ear discomfort symptoms, should promptly seek medical attention to identify the cause of the targeted treatment.