However, in many cases some genetic defect (for example Klinefelter syndrome), underlying disease (for example liver disease), or a certain medication is found to be responsible.

• 可是，在许多病例中，某些遗传缺陷(例如克莱里菲尔特综合征 )、潜在疾病(例如肝脏疾病)或某些药物是其病因。