A symptom is any characteristics of a person's actions, thoughts, or feelings that could be a potential indicator of a mental disorder, and a syndrome is a constellation of interrelated symptoms manifested by a given individual. According to DSM-IV, a syndrome is considered to be a mental disorder if, and only if, it satisfies the following three criteria:
1. it involves a clinically significant detriment
2. it derives from an internal force
3. it is not subject to voluntary control 引自 Personality and Disorders
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