Brittle and easily broken finger nails can be caused by fungal infections, malnutrition, anemia and other diseases. 1. Nail fungus disease. Nails are infected by fungus, causing nail fungus disease, which mainly manifests as abnormal nail plate and nail bed, resulting in discoloration, brittleness, thickening and loss of nails. 2. Malnutrition. Frequent partiality, picky eating, anorexia, resulting in malnutrition of the body, may have an impact on the growth of nails, resulting in brittle nails, easy to break. 3. Anemia. For example, patients with iron deficiency anemia may have changes in their nails. Patients mainly show that the nails are pale and bloodless, and sometimes the nails may become thin and break easily. Nails are brittle and easy to break, if the patient’s symptoms progressive aggravation, it is recommended to pay attention. If necessary, go to the hospital for examination to find the cause and treat it if necessary.