There is a white circle (that is, a semicircle') inside the fingernail. According to the doctor, does it mean that there is something wrong with a person's health?

Usually, nails account for 3/5 of the fingers, arched in a rectangular shape, and the transverse diameter at the top is slightly larger than that at the base. The white half-moon part of the nail root is called nail half-moon, which is also commonly known as nail white in folk, just located in the center of each finger, and there is no big deviation. Speaking of it, when all fingernails have proper nail whitening, it can be inferred that human health is in good condition. If 10 fingernails are not or only a little white, it means that the body is exhausted or sick. The ideal nail polish should account for about 1/5 of the nail area. Too much or no nail polish doesn't mean you are strong. If the crescent moon at the bottom of the nail is big, it means that the blood circulation is fast. If it is small, it means that the blood circulation is not good. In extreme anemia, the crescent moon will disappear completely. From the perspective of traditional Chinese medicine, if the crescent moon on a person's nails is radian and shiny, it means that this person's qi and blood are full. If the crescent moon becomes smaller or gradually disappears, it means that the human body's qi and blood are declining and its physical condition is not as good as before. Judging your health from the crescent moon of your fingernails is only one of the contents of Chinese medicine. You can't just rely on this method to judge whether you are sick or not, but you still have to go to the hospital for examination.