憂鬱症(中國大陸、香港作抑鬱症)一般指以抑鬱為特點的精神障礙:

  • 抑鬱障礙depressive disorders):以心境低落為特徵的一類精神障礙,包括重性抑鬱障礙、惡劣心境障礙等;
  • 重性抑鬱障礙major depressive disorder):抑鬱障礙的典型代表。

也指以抑鬱為特點的某類精神狀態:

  • 抑鬱depression):以心境低落為主的一類情緒狀態或綜合徵;
  • 憂鬱病melancholia):以抑鬱心境為主要特點的一種精神病理狀態。

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