Nail cap loss is considered to be caused by trauma, onychomycosis, malnutrition and other diseases. 1. trauma: if there is a history of trauma, nails are injured by external force, the situation of shedding may occur, and will be accompanied by pain, redness and swelling and other uncomfortable symptoms. 2. ringworm of the nail: ringworm of the nail is a disease caused by dermatophytes invading the nail plate or nail bed, the main causative organisms are Trichophyton rubrum, Candida, etc., and the triggers are trauma, immunity decline, etc., and the nail plate of the patient will appear cloudy, thickening or peeling off and other symptoms. 3. Malnutrition: Malnutrition is a disease caused by insufficient or imbalanced nutritional intake. If you don’t pay attention to your diet, and have the habit of partiality and picky eating, patients will not only suffer from weight loss and emaciation, but also have nail changes, such as nail cover loss. There are many reasons for nail loss, so it is recommended that patients pay more attention to strengthening nutritional intake, and consult a doctor for a clear diagnosis if necessary. Daily attention should be paid to personal hygiene, keep hands and nails clean to avoid recurrence of the disease.