Nail meniscus is caused by the different growth rate between the middle and the two sides of the nail, it is a normal physiological phenomenon, related to the nutrition of the body, physical quality and other reasons. Half-moon mark is part of the nail bed at the bottom of the nail, which is nourished by the connective tissue. When the body intake of nutrients is normal, the connective tissue normally provides nutrients to the nail bed, so the nail grows gradually, and the growth rate of nails in the middle and on both sides is different, so there are half-moon marks on the nails. When the body due to infrequent exercise, irregular diet, often stay up late and other reasons lead to a decline in physical quality, the body’s blood supply system can not act in a timely manner, which will lead to the connective tissue function is impaired, the half-moon scars on the nails will become smaller or gradually disappear. If the patient’s fingernail half-moon mark is relatively small or have other discomfort, you should go to the hospital in time to consult, early formal treatment.