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Breakthrough bleeding (BTB) is any of various forms of vaginal bleeding,〔(Farlex Medical Dictionary > Breakthrough Bleeding ), in turn citing: *Segen's Medical Dictionary. Copyright 2012 *McGraw-Hill Concise Dictionary of Modern Medicine. Copyright 2002〕 usually referring to mid-cycle bleeding in users of combined oral contraceptives,〔 as attributed to insufficient estrogens.〔 It may also occur with other hormonal contraceptives. Sometimes, ''breakthrough bleeding'' is classified as ''abnormal'' and thereby as a form of metrorrhagia,〔( Merriam-Webster's Medical Dictionary > Breakthrough bleeding ) Retrieved on Feb 28, 2010〕 and sometimes it is classified as ''not abnormal''.〔 ==Presentation== The bleeding is usually light, often referred to as "spotting," though a few women may experience heavier bleeding. Many women find that the breakthrough bleeding ceases after one or two cycles. 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「breakthrough bleeding」の詳細全文を読む スポンサード リンク
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