Fewer and fewer crescents on the nails may be a physiological phenomenon, or it may be due to malnutrition, chronic diseases and other reasons. 1. Physiological phenomenon: with the gradual growth of age, the body’s metabolism will slow down, which will cause the phenomenon of diminishing fingernail crescent. 2. Nutritional deficiencies: for example, lack of vitamins, lack of trace elements, anemia, etc., may cause the crescent moon on the nails to become less and less. 3. Chronic diseases: For example, hypothyroidism affects the normal metabolism, and chronic tumors and other consumptive diseases may also cause diminishing nails. The crescent on the nail is getting less and less, if it is a physiological phenomenon does not need to be treated, if there is a disease should be actively treated.