The cause of fingernail lifting, also called spatulate nail, is complex and related to genetics, diseases, nutrition and other factors. 1. Heredity: congenital spatulate nails are mostly caused by heredity, with a certain family aggregation, and there is no clear treatment for this condition. 2. Disease: When patients suffer from psoriasis, chronic eczema, acanthosis nigricans, lichen planus and other diseases, the nails will be damaged, and the spatulate nail will appear. 3. Nutrition: patients may also be caused by iron deficiency or other trace element deficiencies, usually you can have a balanced diet and eat more foods rich in iron and calcium, such as shrimp skin, pig liver and so on. If the symptoms of nail buckling are serious, the patient should go to the hospital in time, actively treat the primary disease and remove the triggering factors.