Discussion: Your tongue is a mirror to the condition of the internal organs. You'd be surprised, but this is a very accurate tool still used today in traditional Chinese medicine.

Diagnosis using the tongue is prevalent in Traditional Chinese Medicine, even today. It is relatively easy. You will find videos and accurate explanations. The desired color of the tongue for its entire length is pink-red, without membranes, bumps, or uneven texture in light colors.

Link: TCM: Cupping, Scraping, Ginger Therapy, Medicinal Leeches.
https://www.sf-healing.com/page/137 (Copy & Paste)