Longitudinal ridges are vertical stripes on the nail surface and are often a sign of malnutritional disorders of the nails. The cause of longitudinal ridge is usually considered to be micronutrient deficiencies and malnutrition, and it can also occur with prolonged sleep deprivation and aging. Mild longitudinal ridge can be observed for a long period of time, and it will become more obvious with age, but it usually does not cause any other discomfort. In the case of severe longitudinal nail ridge, the nails may become thin and brittle, and the distal nails may break easily, in addition to the appearance of longitudinal stripes on the nails. It is recommended to pay attention to the supplementation of micronutrients in daily life. Diet can eat more kiwi, tomato and other foods rich in micronutrients, and supplement high quality proteins such as eggs and lean meat appropriately every day to achieve a diversified diet. Ensure regular and sufficient sleep, avoid staying up late, and strengthen physical exercise.