The crescent moon can reflect the health of the body to some extent. For example, when there are problems with circulation and nutrition, the edges of the crescent may become fuzzy, smaller or disappear, and if there are deficiencies in certain micronutrients, it can cause a change in color pattern.

However, this does not mean that you can always tell what kind of disease you have based on the condition of the crescent. The shape of the crescent is not specific to the disease, and there are many possibilities for causing circulatory disorders, so the condition of the nails cannot be matched to the disease. In addition, some external conditions, such as exposure to corrosive liquids, acidic or alkaline substances, or the behavior of children chewing on their nails, may lead to changes in the crescent. To diagnose a disease, Chinese medicine practitioners generally consider the condition of the entire nail, such as nail color, luster, and shape, but also a combination of facial color and pulse, which cannot be viewed in isolation, not just how many crescents are present.

Many people like to compare the crescent moon with others, experts pointed out that this is not scientific. Small crescent moon scientific name for "nail half moon", is a natural phenomenon formed in the process of nail growth, just newborn nails have not yet fully keratinized. Some people may not be able to see the half-moon because they are born with a backward nail, or because their nails grow slowly, etc. So everyone has a half-moon. So, everyone has a meniscus, some just can't see it. In most people, the size and amount of the half-moon is a result of individual differences. Experts also pointed out that the number of crescent moon varies from person to person, and there is no strict so-called "how much is healthy" division standard in Chinese medicine.

If you compare yourself with yourself, you can use it as a reference. For example, if you find that the color and shape of your crescent teeth are suddenly and obviously different from before in a short period of time, it suggests that there may be something wrong with your body, and you can ask your doctor to see if there are any accompanying diseases.