Otologists often prescribe 3% hydrogen peroxide to patients with otitis media, so that the patient used to wash the ear, many patients with a large bottle of clarified liquid do not know what to do and how to use, and some are even worried about the danger of hydrogen peroxide flowing into the brain. Hydrogen peroxide standardized Chinese name for hydrogen peroxide aqueous solution, the appearance of colorless transparent liquid, with a weak special smell. Hydrogen peroxide has strong permeability and oxidizing effect, medical use of hydrogen peroxide to clean wounds and local antibacterial. Commercially available hydrogen peroxide concentration of 30%, bleaching effect and corrosive, medical hydrogen peroxide concentration of only 3%. It is antibacterial and especially kills anaerobic bacteria, such as tetanus, so it is often used in wound cleaning. Hydrogen peroxide is very unstable will decompose into water + oxygen, normal storage when this process is still relatively slow. The human body contains a variety of biological enzymes, can play a catalytic role, and in the body’s tissue fluid contains hydrogen peroxide enzyme, can decompose hydrogen peroxide, when hydrogen peroxide and skin, mucous membrane wounds, pus or dirt encounter will accelerate the decomposition of the contact to generate oxygen (quite fast) will see a large number of small white bubbles come out. This has not yet combined into oxygen molecules of oxygen atoms, has a strong oxidizing ability, and bacteria in contact with the bacteria, can destroy the bacterial organism, kill bacteria, especially anaerobic bacteria. The remaining material after killing bacteria is water without any toxicity or irritation. It will not form secondary pollution. Therefore, hydrogen peroxide is an ideal disinfectant for wound disinfection. However, large concentrations of hydrogen peroxide should not be used for wound disinfection to prevent burns to the skin and the affected area. As mentioned above, hydrogen peroxide will gradually decompose and become ineffective if left for a long time, so once you find that the foam is very little or disappears when you wash it, you should re-acquire it, lest it affect the efficacy of the treatment, and hydrogen peroxide is cheap, so you don’t need to worry about it. If otitis media lesions produce very much pus or abnormally thick, local ear drops can not enter the middle ear cavity to play the role of sterilization and anti-inflammatory, and the pus also becomes a good culture medium for bacteria, so you need to use hydrogen peroxide to clean the ear canal and middle ear. Specific method is to instill a sufficient amount of hydrogen peroxide through the ear canal, at this time, hydrogen peroxide and pus dirt contact will produce a large number of small bubbles, easy to present a snow-white appearance, and overflow of the external auditory canal, you can use paper towels to wipe away the overflow of liquid. When the sound produced by the bubbles in the ear disappears, you can pour out the residual water in the ear, and also wash out the pus together, you can repeat the rinsing, and then use a cotton swab to dry the ear canal, and then put in the therapeutic antibacterial drug ear drops, so that the drug can be straightened out to play the role it should be. Patients should be reminded that, in order to avoid vertigo when washing the ear, the liquid should be close to the body temperature, not too cold or too hot, otherwise it may cause vertigo attacks, the patient will feel the sky and earth, nausea and vomiting, once it happens, you can close your eyes and wait quietly, and the symptoms will soon pass, do not have to worry about it too much.