Longitudinal nail sulcus is theoretically harmful to the body. It is a sign of nail dystrophy, mostly due to vitamin and calcium deficiency, and needs to be taken seriously. It is recommended that patients go to the dermatology department to have their condition checked, first of all for micronutrients, so that the cause can be better treated. If it is determined after the examination that the disease is deficient in trace elements, the trace elements can be supplemented appropriately under the guidance of the doctor, and at the same time, the diet should be strengthened, and more nutritious food, such as calcium or food containing more vitamins, should be eaten to ensure the supply of nutrients to the body, and only when the body nutrition is achieved, the disease can be better controlled. During the treatment period, patients should also rest as much as possible, do not let themselves in a long time in a state of exertion, can be appropriate to increase the vegetables and fruits supplement.