"Introduction to Tongue Diagnosis in 8 Minutes: Identify Your Constitution in 1 Minute, Quickly Adjust 4 Types of Tongue Situation, Early Observation for Early Benefits! The tongue is like a special mirror that can reflect our physical condition, reminding us of what should be done and what should not be done. The tongue, also known as the visible internal organ, is covered with a layer of mucosa and rich blood vessels underneath, so it can conveniently and intuitively reflect the condition of internal organs and blood circulation."