Nail loss is considered to be trauma, nail fungus and so on. 1. Trauma: If the nail area is bumped or squeezed, the external force may make the nail fall off. 2. ringworm of the nail: ringworm of the nail is a contagious disease caused by fungal infection, dermatophytes enter the nail plate after the release of a variety of enzymes to break down the splint, destroying the nail plate, most of the ringworm caused by ringworm of the hands or feet, but also may be caused by direct contact or indirect contact with the patient, manifested in the cloudy nails, thickening, separating, discoloration, atrophy, shedding and so on. Nail shedding may have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment.