第一难
难经 · section 1 · 佚名 舊題扁鵲 · 345 characters
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Original text
十二经皆有动脉，独取寸口，以决五藏六府死生吉凶之法，何谓也?
然: 寸口者，脉之大会，手太阴之脉动也。 人一呼脉行三寸，一吸脉行三寸，呼吸定息，脉行六寸，人一日一夜，凡一万三千五百息，脉行五十度，周于身漏水下百刻，荣卫行阳二十五度，行阴亦二十五度，为一周也，故五十度复会于手太阴寸口者，五藏六府之所终始，故法取于寸口也。
第二难 脉有尺寸，何谓也?
然: 尺寸者，脉之大要会也。 从关至尺是尺内，阴之所治也，从关至鱼际是寸口内，阳之所治也。 故分寸为尺，分尺为寸，故阴得尺内一寸，阳得寸内九分，尺寸终始一寸九分，故曰尺寸也。
第三难 脉有太过，有不及，有阴阳相乘，有覆有溢，有关有格，何谓也?
然: 关之前者，阳之动也，脉当见九分而浮，过者，法曰太过; 减者，法曰不及。遂上鱼为溢，为外关内格，此阴乘之脉也。
关以后者，阴之动也，脉当见一寸而沉，过者，法曰太过; 减者，法曰不及。遂入尺为覆，为内关外格，此阳乘之脉也，故曰覆溢。是其真藏之脉，人不病而死也。
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