Nail loss in children may be caused by onychomycosis, onychomycosis, psoriasis and other diseases. 1. Onychomycosis: Onychomycosis may be caused by dermatophyte infection, or it may be induced by nail trauma, poor hygiene habits and other factors. Affected children will have symptoms such as cloudy nail plate, discoloration, shedding and atrophy. 2. Nail groove inflammation: Nail groove inflammation may be caused by bacterial infection, long-term contact with irritants, nail trimming too deep and other factors. Symptoms are localized redness, swelling and pain in the nails. With the development of the disease, the symptoms can be aggravated, and the skin around the nails and the nail plate will be separated, and the nails will fall off. 3. Psoriasis: The cause of psoriasis is not yet clear, and it may be caused by heredity, low immunity and other factors. Affected children will have symptoms such as nail separation, nail pitting and joint swelling. There are many reasons for children’s nails to fall off. Parents can bring their children to the hospital to find out the cause of the disease.