Fingernails without crescent have vertical lines to consider with malnutrition, nail fungus, thyroid function decline and so on. Malnutrition: for picky eaters, partiality or combined with malignant tumors and other chronic wasting disease patients, because of its intake of nutrients is insufficient, so will affect the body’s metabolism affects the growth of the nails and nails without crescent moon, dry, vertical lines and other manifestations. Nail fungus: this disease is due to fungal infection of the nail bed, so the patient will appear nail dryness, thickening, vertical lines or cloudy color and other manifestations, and in severe cases, there will be nail loss and other manifestations. Decreased thyroid function: If the crescent becomes less or disappears, it may also be related to diseases, such as decreased thyroid function. Fingernails without crescent teeth with vertical lines may also be other reasons, also common in normal patients, such as accompanied by other discomforts, it is recommended to go to the regular hospital, clear cause of the disease under the guidance of the doctor active treatment.