Vitamin deficiencies or fungal infections can ... American Osteopathic College of Dermatology. Brittle splitting nails. Chessa MA, Iorizzo M, Richert B, et al. Pathogenesis, clinical signs and ...
A split nail (onychoschizia) is a vertical or horizontal crack through the fingernail. The nail may also feel soft, thin, or brittle. Injury, harsh chemicals, psoriasis, nail fungus, or vitamin ...