抑鬱症(台灣作憂鬱症)一般指以抑鬱為特點的精神障礙:

  • 憂鬱疾患depressive disorders):以心境低落為特徵的一類精神障礙,包括嚴重憂鬱疾患、神經官能性憂鬱障礙等;
  • 嚴重憂鬱疾患major depressive disorder):憂鬱疾患的典型代表。

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症;
  • 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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