The tongue is a response to the internal condition of the body. The old ancestor’s “Huangdi Neijing – Ben Zang” says: “Look at its external response to know its internal storage. This is the truth. The “external response” here refers to the tongue, the pulse, the body shape and face, and so on. When seeing a doctor, we often encounter all kinds of patients, some with long illnesses, some with short illnesses, some with many symptoms, some with few symptoms. Some patients have simple conditions, while others have complex conditions. So how do you distinguish between simple and complex? Simple patients are well treated and complex ones are difficult to treat. Sometimes, the patient may say a bunch of symptoms, which may seem like a lot of symptoms, but in fact it is not difficult to treat. For example, the patient said, “Doctor, my appetite is average, my bowels are not formed, my sexual function is not good, and my hands and feet are cold. The patient says, “Doctor, I have an average appetite, poor bowel movements, poor sexual function, and cold hands and feet. This type of patient, although the symptoms are many, but not difficult to treat, combined with the medical history, is not the typical spleen and kidney Yang deficiency, you only need to slightly use a little warm Yang medicine, he will immediately improve all the symptoms. The direction of symptoms in these patients is homogeneous, and the tongue is simple. Some patients are not so well treated. For example, the patient pictured above said, “Doctor, my sexual function is not good, my appetite is not good, my stool is not formed, and I don’t sleep well, which sounds similar to the patient above. But when the tongue is stretched out, those who understand it will not be optimistic: the tongue is thick and greasy, the root of the tongue is particularly thick, and the sides and tip of the tongue are red without moss. This is a uremic patient, look at these two uremic patients tongue is not a few similarities, tongue two sides of no moss particularly obvious, the middle thick and greasy, why this patient, the color is light, because this patient renal anemia is serious, hematocrit is particularly low, so the tongue light. The following talk about the reasons for the common appearance of this tongue: heart and liver Yin injury is the most important reason is to stay up late, modern civilized society, bringing a rich and colorful life, the invention of electricity and light bulbs, making the division of human activities day and night become less obvious. The old ancestors said to sleep at 11:00 p.m., do not sleep at 11:00 p.m., the body does not get rest will appear heart, liver and kidney yin injury. Whether it is because of engaging in other activities without sleep, or because of other causes of sleep disorders in the body, such people tend to be chronic poor sleepers. When you encounter this tongue, ask often sleep is not possible. As soon as liver yin is injured, liver yang is hyperactive. These people are either anxious or short-tempered. Thick and greasy tongue, the reason for dampness, modern living conditions generally become better, the table has become very rich, and modern people exercise too little, but the spleen and stomach degradation is obvious, fat, sweet and thick taste to eat down to digest, they piled up into phlegm and dampness, is garbage. In the end, it is too much food, too much food and too little exercise. The above two conditions, easy to appear at the same time in a person’s body, is that category: prefer not to sleep at night, more nightlife, always play until midnight to eat barbecue people, so I named this tongue: midnight barbecue tongue.