Nails cracked may be related to the lack of vitamin A, fungal infections, etc., after a clear diagnosis, according to the specific situation can be treated with medication. 1. Lack of vitamin A: Vitamin A is a fat-soluble vitamin with the function of protecting the surface layer of the skin. If the patient is partial to food and does not consume meat for a long period of time, it will lead to the lack of vitamin A in the body, and the situation of cracked nails will occur. You can take vitamin drugs for treatment, such as vitamin A soft capsules, vitamin AD drops and so on. 2. Fungal infection: If the fingernail area is infected by fungus, it will lead to the local nail bed damage, resulting in the local nail growth is poor, there may be cracked nails. You can take antifungal drugs for treatment, such as clotrimazole, econazole and so on. People who are allergic to the ingredients in the above drugs are prohibited from using the drugs. There may be other reasons for cracked nails, and it is recommended that patients go to the hospital in time to find out the cause of the disease, and then standardize the treatment, so as not to delay the condition.