There is a couplet: top couplet – itchy scratch, scratch, itchy on scratch, scratch also itchy, the more scratch the more itchy the next couplet – scratch, scraping, scraping often happy, happy and scraping, while the fun scraping. I believe that a few years old children know that the most direct solution to the itch, that is – scratch. Do not look at this action is simple, small action but contains a big theory. In ancient times, in fact, surgery includes the present-day surgery and orthopedics, such as tendons, veins, flesh, skin, bone disorders, nowadays has been refined, “itchy” this symptom is actually common in dermatology, but orthopedics can also sometimes see such symptoms, in fact, itchy scratch, this small action contains a great truth of Chinese medicine. Here I’ll talk about my understanding of the reason why itchy to scratch. In the Nei Jing, it is said that “all pains and itchy sores belong to the heart” and “all pains are real and all itches are deficient”. We can see that in Chinese medicine, itch is closely related to the heart. This heart is the heart of the form and spirit, not the anatomical heart. The “Source of Diseases” says “wind itch is a body deficiency by the wind, the wind into the coup, and blood and gas, and both between the skin. Evil micro, can not impact for pain, so but also itch.” The “Complete Book of Surgical Evidence” also records that “itchy wind, itching all over the body, and no sores and scabies, scratching more than.” In the ancestral medicine itch and “wind” is also very big relationship. Wind evil can be divided into internal wind and external wind. Blood heat and blood deficiency produce internal wind; external wind evils cause Ying and Wei to be incompatible, both of which can cause itching. So we can also venture this guess, itchy more deficiency. Through the above reasoning, it is easy to see that the action of scratching after itching contains two major effects of body and mind. From a TCM point of view, this can be understood as tuning the mind and the body. First of all, let us discuss why scratching can regulate the mind. From the sensory point of view, the action of scratching gives the itchy person a psychological implication that the action is meaningful, and what is meaningful is to stop the itch. Furthermore, “all pain and itchy sores belong to the heart”. In fact, the Neijing has long recognized that the heart is the master of the blood vessels, and that the internal organs and six internal organs, external moisten the limbs and hundred bones, the skin and flesh, and the tendons, and that the blood and qi run everywhere. The heart is the master of blood vessels and is connected to the summer qi and is a fire organ, belonging to the sun in Yang. Itch is a disease of the epidermis, and the heart is the yang and “part of the table”. In fact, the “heart” in Chinese medicine is very closely related to the heart-brain system in modern medicine. According to the August 7, 2009 issue of the journal Science, scientists have identified a group of neurons in mice that respond to itchy stimuli, and the neurons will inform the brain that it is time to start scratching. The findings themselves scratch a long-standing itch in neuroscience: namely, whether the nervous system disposes of the sensations of pain and itch in the same way. Researchers have debated whether itching is essentially nothing more than a form of pain or whether there are specialized neural pathways for itching, pain, and other sensations in the body. So far, the evidence for this hypothesis remains inconsistent, but a new study by Yan-GangSun should help put the controversy to rest. Researchers have previously identified a neuronal receptor called GRPR as the receptor that senses itchy stimuli but not painful ones. In fact, we can boldly interpret this as “heart disease can be cured by heart medicine. The above has touched on the mind-regulating effect of scratching. Let’s discuss why scratching can regulate the body. As we said before, itch is mostly weak and related to wind. And the action of scratching is formally created to regulate these two points. In the Su Wen? Yangming pulse interpretation” has a cloud: “The limbs are the essence of all yang.” This means that the extremities are the parts of the body where Yang Qi (Yang meridian) originates. Wang Bing Yun: “Yang receives qi in the limbs, so the limbs are the origin of all yang.” Gao Shizhong Yun: “The three yang of the hand go from the hand to the head; the three yang of the foot go from the head to the foot. Therefore, the extremities are the essence of all the yang.” Recently, some people say that “this” is a mistake of “the end”. I think the word “Ben” in this verse can be interpreted as “sign” or “symbol”, that is, the limbs are the sign and symbol of the Yang energy of the human body and can reflect the strength and weakness of the Yang energy of the human body. In other words, the strength and weakness of Yang energy in the human body can be verified in the limbs. The upper extremities of the fingers are the end of the flow of all Yang Qi to the end of the nodes, scratching the skin with the hands is actually the infusion of Yang Qi for the skin. The itch is mostly deficient, and with the help of Yang, Yang can grow into Yin and harmonize Ying and Wei to stop the itch. As we all know, the wind is evacuated, the wind is wandering and leaping with the skin surface, scratching this action, by scraping the skin back and forth, can reach the point of evacuating the wind evil. We all know that scratching this action can only temporarily stop the itch, which means that scraping can only evacuate the surface wind. The scratching action alone cannot achieve the purpose of completely stopping the itch. From a modern medical point of view, external chemical stimulation allows the skin to produce a local immune response, which stimulates the subcutaneous nerves to produce the itching sensation. External physical stimulation is the direct stimulation of the subcutaneous nerve. The human nerve has a threshold, and only at a certain level can a potential be triggered to be transmitted to the brain for the person to feel this threshold. There are two stages, when the stimulation does not reach the second stage and exceeds the first stage of performance as itch; beyond the second stage of pain is felt. It can also be said that itching is actually a mild pain, but it is very mild. The reason why scratching feels better is because the scratching action has exceeded the second stage of the nerve threshold, so that the pain is more than before, and this action produces a mild pain is acceptable to you, so it will not feel so itchy and uncomfortable. Although the itch is milder than the pain, the stimulus he transmits to the brain is no weaker than the discomfort caused by the second stage of pain, so you feel less itchy after scratching.