The loss of nails may be related to trauma, fungal infections, lichen planus and psoriasis, etc. After symptomatic treatment, the nails can grow back under normal circumstances. 1. Trauma: if the nail root and nail bed are not seriously damaged, the stromal cells of the nail root can continuously regenerate and keratinize to form nails, and the rich blood vessels on the surface of the nail root and the nail bed can provide the necessary nutrition for the growth of nails, thus prompting the growth of nails. 2. Onychomycosis: If nail loss is caused by onychomycosis, it can be cured after timely treatment with broad-spectrum antifungal medication, and the lost nails can grow gradually until they return to normal. 3. Nail lichen planus: Nail lichen planus and the resulting nail separation and shedding, after giving glucocorticoid drugs (betamethasone), immunomodulators (tacrolimus), retinoic acid drugs (retinoic acid cream), the shedding of nails can gradually return to normal. 4. Psoriasis nail: it refers to a phenomenon in which psoriasis involves the nails, leading to separation or even shedding of the nails, and the shedding of the nails can be gradually restored to normal through standardized immunomodulation therapy (tacrolimus) and biologic agent targeting (skuticosumab) treatment. If you lose your nails, you should consult a doctor for an evaluation of the recovery of your nails.