Nail cap loss should be treated according to the cause of loss, the common causes are trauma, nail malnutrition, fungal infection. 1. Trauma: the most common cause of nail loss is due to trauma, in this case, we should clean the wound and wait for the new nail to grow out slowly. 2. Nail malnutrition: If the nail is malnourished, the nail will also gradually mottled off, this situation should be appropriate to supplement a variety of micronutrients, especially calcium, zinc and other micronutrients. 3. Nail fungus: fungal infection of the nail can also cause nail loss or hollow, this situation should follow the doctor’s prescription oral antifungal drugs, to control the fungus after the new nail will grow well, commonly used antifungal drugs are oral terbinafine capsules, itraconazole capsules and so on. It is recommended to go to the hospital in time after the nail cover falls off, under the guidance of the doctor’s treatment.