Tongue signs of Yin deficiency and internal heat are usually characterized by reddish tongue, little moss and dry tongue surface. 1. Reddish tongue: due to Yin deficiency and internal heat, Yin does not control Yang, and internal heat is inflamed, resulting in faster blood flow, which leads to the phenomenon of reddish tongue. 2. Less moss: fluid is one of the necessary substances for the growth of tongue moss, due to yin deficiency and internal heat, resulting in insufficient fluid, gastric qi loss of nourishment, can not be glorified on the tongue, the phenomenon of less moss will occur. 3. Dry tongue: Yin deficiency is mainly a deficiency of essence, blood, fluid and other substances in the body, due to Yin deficiency can not control Yang, can not lose the distribution of fluid, coupled with internal heat depletion of fluid, which in turn appears on the tongue surface of the phenomenon of dryness and less fluid. In addition to the above tongue manifestations, there are some physical symptoms such as hot flashes (a burst of heat), night sweats, insomnia, dry mouth and throat, five heart-heat (heat in the heart of the two hands and two feet, and self-consciousness of the heart and chest heat) and so on. Patients with Yin deficiency and internal heat are advised to go to a regular hospital for treatment under the guidance of a medical professional who can identify and treat the symptoms.