What we call Yang deficiency is the lack of light and heat in our body’s little sun. As we all know, everything grows by the sun. We often say, “The sun is out, it’s so warm!” . The sun gives us life and gives us energy. The energy produced by the sun is constantly emitted into the universe in the form of radiation. That is why the sun is the main source of light and heat on earth. The sun transmits light and heat to the Earth every moment. With the sun’s light, the plants on Earth are able to carry out photosynthesis. In the same way, the human body is a small universe, and we have our own little sun inside us, which also emits “warm” body, “invigorating” spirit and “transpiring” water for youth and health. Yang is the source of vitality. First of all, the body is warmed by Yang energy to maintain a normal body temperature. If our body is without Yang, just like our earth without the sun, it loses Yang warmth and is prone to cold symptoms. This is also why when people die. This is the reason why the body is cold when a person dies – the yang energy is gone. The strength of the “warming” function of Yang energy can be seen by observing the people around you. People with weak Yang Qi “warming” function will feel cold even in the hot summer sun. On the contrary, a person with strong Yang Qi “warming” function can wear only one piece of clothing when others are wearing two or three pieces. Yang deficiency, there is cold in the body, there will be some reactions. What is the reaction? It means that you like to eat hot food and cannot eat cold food. In addition, yang energy can also “invigorate” the spirit. In nature, where there is sufficient sunshine and the climate is warm and suitable, plants and animals are strong; on the contrary, where the sunshine is short and the weather is cold, there is not enough vitality, plants wither and animals hibernate. People are the same, some people are full of energy, full of vitality; some people are depressed, even reluctant to talk, up to some are inseparable from the role of Yang Qi “invigorating”. In addition, Yang Qi has the function of “transpiration” of water and liquid to promote the metabolism of water and liquid. With the operation of Yang Qi, it is possible for water and liquid to “get warm and go”. Insufficient Yang Qi in the body will not have the strength to vaporize water and liquid, so the stool is always thin and the urine is clear and long. When Yang Qi is deficient, it does not have the power to stimulate the body to metabolize water and fluid, so there are some corresponding manifestations on the tongue and pulse. Yang Qi deficiency. The water-dampness in the body cannot be transformed, so there is a light mouth and nothing tastes good; one does not like to drink water and is not thirsty. Insufficient yang qi will have a low function of “warming” the body, “invigorating” the spirit, and “transpiration” of water and fluids, which will clinically manifest as fear of cold, cold extremities, fatigue, weakness, weak pulse, and a fat tongue. The clinical symptoms include fear of cold and coldness, cold limbs, fatigue, weakness, weak pulse, fat tongue with teeth marks, etc. Specifically, people with deficient heart yang will have symptoms such as chest tightness and shortness of breath, cold chest, chest pain, cold hands and feet, and blue and stagnant lips and tongue; people with deficient liver yang will be depressed, easily fatigued, and irritable; people with deficient lung yang will have symptoms such as shortness of breath, coughing at night, shortness of breath, and will be easily pessimistic and disappointed; and people with deficient kidney yang will have a dark complexion and lack of energy. The face is dark, no spirit, low libido, low sexual function, easy to irritability, night urination, and also have the symptoms of cold below the waist; spleen Yang deficiency into, more appetite, indigestion, easy diarrhea, abdominal distension, and more easily obese than normal. Yang deficiency body cold, mainly in three aspects: the first is the Wei Yang deficiency, mainly manifested as the body is afraid of cold, afraid of wind, limbs, and even the waist and back cold and a series of cold phenomenon; the second, is the deficiency of cold in the Jiao, the stomach is afraid of cold, can not eat cold things. The third is the lower anxiety cold, mainly manifested in the waist fear of cold, cold buttocks. The genitalia are afraid of cold, etc., and the small stomach a blowing wind, immediately pain and discomfort. Yang deficiency, there is cold in the organism, there will be some reactions. What reaction? It is the preference for hot food and the inability to eat cold food. Yang energy can warm the body, but also can transpire warm water, in order to promote water metabolism, with the operation of Yang energy, the water can “get warm and go”. If the body is deficient in Yang Qi, it does not have the strength to metabolize water and fluids, so the stool is always thin and the urine is clear and long. When Yang Qi is deficient, it does not have the power to stimulate the body to produce metabolism. Therefore, there are some corresponding manifestations on the tongue and pulse. Yang Qi deficiency. The water-dampness in the body can not be transformed, so there is a light mouth, eat anything without taste; do not like to drink water and do not thirst.