Nails are thin, brittle and easy to break considering and nail fungus, brittle nail disease, iron deficiency anemia and other diseases related. 1. ringworm of the nail: early ringworm of the nail plate will appear discoloration, become brittle or easy to separate and so on. The cause of the disease may be due to the infection of the nail plate by dermatophytes, and the disease may be induced by nail injury, local blood circulation disorders, and the wearing of breathable shoes. 2. Brittle nails: Brittle nails may be related to systemic diseases, vitamin deficiency and other factors, and patients will have symptoms such as thinning, longitudinal cracking and separation of nails. 3. Iron deficiency anemia: the formation of this disease is mainly related to the body’s iron excretion, absorption imbalance, the patient’s nails will appear abnormalities, such as pale nails, thinning and equality, may appear easy to break. The causes of thin and brittle nails are not unique, and patients are advised to go to regular hospitals to clarify the causes of the disease.