Finger nail vertical cracking is considered to be nail malnutrition, trauma, nail fungus, etc., can be relieved by strengthening nutrition, medication and so on. 1. Nail malnutrition: If the nutritional intake is not balanced, especially the lack of calcium will lead to nail malnutrition, vertical cracking, you should strengthen the nutrition, eat more calcium-containing foods, such as soybean products, dairy products, and more outdoor exercise to promote calcium absorption. 2. Trauma: finger nail trauma can also cause vertical cracking, this situation generally do not need special treatment, and so on the new nails grow out after the symptoms will disappear. 3. Tinea cruris: Tinea cruris is a nail lesion caused by dermatophytes that invade the nail plate and the nail bed, which can cause the fingernails to crack vertically, and it needs to be treated with medication, which can be coated with amorphophallus powder and miconazole, and can also be taken orally to take antifungal drugs, such as terbinafine and itraconazole. Fingernail vertical cracking, according to the specific causes of the choice of appropriate treatment, the above medication should be used under the guidance of a doctor, avoid self-medication.