Tongue coating thick white middle crack is dampness, phlegm (water metabolism disorder formed by the pathological products) food accumulation (food indigestion and stagnation in the stomach) in the body for a long time accumulation of heat, depletion of fluid caused by. Tongue moss is the stomach gas upward fumigation of the stomach grain, food turbidity, cohesion in the tongue and the formation of the normal tongue moss is generally thin white uniform, dry and wet moderate, the tongue surface of the middle and the root of the slightly thick. The thickness and thinness of the tongue moss is standardized by the criteria of “seeing the bottom” and “not seeing the bottom”, and those who can’t see the quality of the tongue through the tongue moss are called thick moss, or not seeing the bottom of the moss. Thick moss is often the result of evil spirits being present in the tongue, or phlegm and food accumulating in the tongue. The color of the tongue moss is white, usually normal tongue moss or the main surface evidence, cold evidence, thick white tongue moss is mostly dampness, or phlegm and food accumulation, tongue moss cracking is mostly due to the loss of fluids. Therefore, tongue coating thick white middle cracking is mostly dampness, phlegm food accumulation in the body for a long time to heat, depletion of fluid due to. Tongue coating to some extent can reflect the human body’s gastrointestinal situation, but the diagnosis of disease can not blindly rely on looking at the tongue coating, if there is any physical discomfort, you should go to the hospital for a comprehensive examination.