What does the crescent on the nail represent?

Traditional Chinese medicine believes that "liver, its flower in the claw". Claw refers to the fingers and toes, so the crescent of the nail is first related to the liver. Liver is stored blood, when the liver stored blood sufficient, liver function normal operation, the nail will be bright luster, crescent obvious, if the liver stored blood decreased, it will show that the nail dry, crescent reduced or disappeared. At the same time, the function of liver storing blood is also related to spleen. Spleen can transport the essence of water and grain, which is the source of qi and blood biochemistry. Therefore, the normal function of spleen is related to the function of liver storing blood. Then there is heart. Heart governs blood vessels. It can promote the normal operation of blood. Blood vessels run well, and the function of liver storing blood is normal. Therefore, the function of heart governing blood vessels also affects the function of liver storing blood. Therefore, the crescent of nails not only reflects the function of liver, but also relates to spleen and heart.