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Mastitis (also called mammitis) is the inflammation of breast tissue. ''S. aureus'' is the most common etiological organism responsible, but ''S. epidermidis'' and streptococci are occasionally isolated as well.〔(Medscape: Medscape Access )〕 Mastitis can be classified as milk stasis, non-infectious or infectious inflammation and abscess. It is impossible to correlate this classification with clinical symptoms. In particular, milk stasis, non-infectious and infectious inflammation can be distinguished only by leukocyte count and bacteria culturing. Symptoms like fever, intensity of pain, erythema or rapid onset of symptoms can not be used to distinguish these. Early stages of mastitis can present with local pain, redness, swelling, and warmth. Later stages also present with systemic symptoms like fever and flu-like symptoms and in rare cases an abscess can develop. However it is pretty common that symptoms develop very quickly without any warning. Except in severe cases it is not necessary to wean a nursling because of mastitis; in fact, nursing is the most effective way to remove the blockage and alleviate the symptoms. Sudden weaning can cause or exacerbate mastitis symptoms and cause hyponatremic shock in the infant. Continued breastfeeding does not present any risk to the nursing infant and is very beneficial for the mother.〔〔 == Terminology == Popular usage of the term ''mastitis'' varies by geographic region. Outside the US it is commonly used for puerperal and nonpuerperal cases, in the US the term nonpuerperal mastitis is rarely used and alternative names such as duct ectasia, subareolar abscess and plasma cell mastitis are more frequently used. Chronic cystic mastitis is a different (older) name for fibrocystic disease. American usage: mastitis usually refers to puerperal (occurring to breastfeeding mothers) mastitis with symptoms of systemic infection. Lighter cases of puerperal mastitis are often called breast engorgement. In this Wikipedia article mastitis is used in the original sense of the definition as inflammation of the breast with additional qualifiers where appropriate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mastitis」の詳細全文を読む スポンサード リンク
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