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Some diseases are also associated with changes in the nails, which can include brittleness. Thin and brittle nails can be a sign of hypothyroidism, for example. The term onychoschizia refers to splitting of the fingernails as well as brittle or soft nails. Taking biotin (a vitamin) supplements can help in some cases of brittle nails, and application of moisturizers after soaking in water can also be of benefit. Medically Reviewed by a Doctor on 3/30/2015.
Medical Conditions. Peeling and breaking of the fingernails can be caused by a fungal infection of the nails. Less commonly, brittle nails are due to other nail or skin conditions, such as psoriasis. Sometimes, brittle nails are a sign of a general medical condition, such as thyroid disease or diabetes.ronically, some nail care products, such as nail polish or nail polish remover, can damage nails and make them brittle. Acrylic nails and tips are particularly likely to promote breaking and peeling. Using a moisturizer and avoiding exposure to chemicals can help restore your nail health.