Yìyùzhèng shì yì zhǒng chángjiàn de jīngshén zhàng'ài.
Depression is a common mental disorder.
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Clinical term. Contrast with colloquial and stigmatizing labels like 神经病 (shénjīngbìng - often thrown as an insult). 精神障碍 is what appears in the PRC classification 《中国精神障碍分类与诊断标准》 (CCMD).