Hand crescent is not necessarily an unhealthy manifestation, it may be a natural phenomenon, or may be caused by malnutrition, other diseases and other factors. 1. Natural phenomenon: the crescent is the half-moon mark on the nail, the crescent on the fingernail is the newborn, not yet fully keratinized nails. Due to individual differences, some people’s crescent is more obvious and reddish; some people’s crescent is less obvious. 2. Malnutrition: If you are often partial to food, picky eaters, excessive weight loss leading to malnutrition, it will have an impact on the growth of nails, which may lead to a reduction in the number of crescents. 3. Other diseases: Chronic digestive diseases, endocrine system diseases, tumor diseases, etc. may affect the normal growth of nails and lead to the reduction of crescent teeth. It is recommended to pay attention to nutritional supplementation, if the body does not have any discomfort, generally do not need special treatment. If accompanied by other symptoms, it is suspected to be caused by pathological factors, it is recommended to go to the hospital to find the cause.