In Chinese medicine, tongue is considered as a sensitive organ, which contains a lot of water, mucus, enzymes,...

Originally shared by Jewel for healing

In Chinese medicine, tongue is considered as a sensitive organ, which contains a lot of water, mucus, enzymes, electrolytes and in accordance with changes in the tongue is related and changes to specific organs in the body. 

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http://www.jewelforhealing.com/2016/01/tongue-in-chinese-medicine.html