There are more reasons for nails to fall off from the roots, and common causes include gray nails, iron deficiency anemia, and trauma. It is recommended to visit the hospital for examination and targeted treatment according to the specific situation.1. Grey nail: a disease caused by dermatophyte infection of the nail bed or nail plate, patients may have thickened, discolored and peeling nails due to local fungal infection, which can be manifested as nails falling off from the roots. Topical application of terbinafine tincture solution and amorolfine hydrochloride application may be applied for relief. If the situation is more serious, you also need to take Itraconazole capsules with the treatment; 2, iron deficiency anemia: iron deficiency anemia is an anemia caused by the lack of iron in the body, if the situation is more serious, will lead to nail malnutrition, may make the nail from the root off. Need to take ferrous gluconate syrup under the guidance of a doctor to relieve, daily intake of iron-rich food, such as pig liver, spinach, etc.; 3, trauma: If the patient is accidentally struck by external objects or collision, resulting in local damage to the nail, it is possible to make the nail tissue necrosis, the nail from the root off. If the bleeding is serious, it can be disinfected by applying iodophor. If there is no bleeding, no special treatment is needed and new nails will gradually grow; 4. Kawasaki disease: Kawasaki disease is a common acute self-limiting vasculitis that causes rashes, fever, swollen lymph nodes, and some patients with severe disease may also have abnormal changes in the nails, causing them to fall off from the roots, it is not clear whether the infection is directly caused by the infection or the infection causes an immune response to the meth It is not clear whether it is caused directly by infection or by an immune response to methylation caused by infection. You can take aspirin enteric capsules and injections of immunoglobulin as prescribed by your doctor to relieve the problem, take care of localized nail loss sites, rashes and other injuries, prevent infection, and provide symptomatic treatment such as rehydration and fever reduction if necessary.