Many diseases can lead to nail breakage, there is no fixed four diseases, common nail trauma, nail malnutrition, nail fungus and so on. 1. Nail trauma: when the nails are traumatized by external forces, it is easy to have the problem of broken nails, which will also be accompanied by pain, redness, swelling, bleeding and other phenomena. 2. Nail malnutrition: Inflammation of the nail mother or nail bed leads to abnormal structure and appearance of the claw nail. 3. Ringworm of the nail: mainly fungal infection, resulting in nails become easy to break, and in severe cases, the phenomenon of shedding will also occur. Nail breakage causes more, should be timely medical examination, clear diagnosis.