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earwax
Earwax, also known by the medical term cerumen , is a yellowish waxy substance secreted in the ear canal of humans and other mammals. It protects the skin of the human ear canal, assists in cleaning and lubrication, and also provides some protection from bacteria, fungi, insects and water.〔(Earwax ) at the American Hearing Research Foundation. Chicago, Illinois 2008.〕
Earwax consists of shed skin cells, hair, and the secretions of the ceruminous and sebaceous glands of the outside ear canal. Major components of earwax are long chain fatty acids, both saturated and unsaturated, alcohols, squalene and cholesterol.〔 Excess or compacted cerumen can press against the eardrum or block the outside ear canal or hearing aids, potentially causing hearing loss.
==Signs and symptoms==
Excessive earwax may impede the passage of sound in the ear canal, causing conductive hearing loss. Hearing aids may be associated with increased earwax impaction. It is also estimated to be the cause of 60–80% of hearing aid faults.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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