五行诊断
- 指导四诊:
- 面青,喜酸,脉弦----肝病.
- 面赤,口苦,脉洪数----心火亢盛.
- 脾虚病人的面色青,为木乘土.
- 心病病人的面色黑,为水乘火.
2 推断病情
- 1 )主色(五脏本色)胜客色(应时之色),病为逆.
- 客色胜主色,病为顺.
2 ) 色脉相符为顺,色脉不相符为逆.
阐释:用于诊断 人体是一个有机整体,内脏有病可以反映到体表,“有诸内者,必形诸外”,故曰:“视其外应,以知其内脏,则知所病矣”。(《灵枢·本脏》)当内脏有病时,人体内脏功能及其相互关系的异常变化,可以反映到体表相应的组织器官,出现色泽、声音、形态、脉象等诸方面的异常变化。由于五脏与五色、五音、五味等都归属于五行这就是五行学说在诊断中的应用。所以说“上古使僦贷季,理色脉而通神明,合之金、木、水、火、土、四时、八风、六合,不离其常,变化相移,以观其妙。欲知其要,则色脉是矣。”(《素问·移精变气论》)因此,在临床诊断疾病时,就可以综合望、闻、问、切四诊所得的材料,根据五行的归属及其生克乘侮的变化规律,来推断病情。正如《难经·六十一难》所说:“望而知之者,望见其五色,以知其病。闻而知之者,闻其五音,以知共病。问而知之者,闻其所欲五味,以知其病所起所在也。切脉而知之者,诊其寸口,视其虚实,以知其病,病在何脏腑也。”如面见青色,喜食酸味,脉见弦象,可以诊断为肝病;面见赤色,口味苦,脉象洪,可以诊断为心火亢盛。脾虚的病人,面见青色,为木来乘土;心脏病人,面见黑色,为水来克火,等等。
由于内脏精气的华彩猛虎下山于颜面,所以古人很重视面部的色诊。“天有五气,食人入鼻,藏于五脏,上华面颐。肝青心赤,脾脏色黄,肺白肾黑,五脏之常,脏色为主,时色为客,春青夏赤,秋白冬黑,长夏四季,色黄常则,客胜主善,主胜客恶”。(《医宗金鉴·四诊心法》)如果色诊与脉诊结合起来应用,从客观上能够大致反映出疾病的状况,故曰:“能合脉色,可以万全。”(《素问·五脏生成篇》)但从色脉来判断病情又与五行生克有关,“见其色而不得其脉,反得其相胜之脉则死矣。得其相生之脉,则病已矣。”(《灵枢·邪气脏腑病形》)“色脉相全,青弦赤洪,黄缓白浮,黑沉乃平。已见其色,不得其脉,得克则死,得生则生”。(《医宗金鉴·四诊心法》)如肝病色青见弦脉,为色脉相符,如果不得弦脉反见浮脉则属相胜之脉,即克色之脉(金克木),为逆;若得沉脉则属相生之脉,即生色之脉(水生木),为顺。
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