White nails may be caused by calcium deficiency, gray nails or iron deficiency anemia. 1. Calcium deficiency: If you don’t pay attention to nutrition, resulting in calcium deficiency and malnutrition, it may lead to white fingernails, and the nails will become more fragile. 2. Gray nails: gray nails are mainly caused by fungal infections, such as purple trichophyton and Sudanese trichophyton, etc. After suffering from gray nails, the nail cover of the patient may turn white. 3. Iron deficiency anemia: iron deficiency anemia is also referred to the lack of iron in the patient’s body, patients with this disease may have pale skin and mucous membrane phenomenon, usually may also affect the palms of the hands as well as the nail bed and other parts of the body, resulting in whitening of the fingernail cover. There may be other reasons for the whitening of the fingernail cover, it is recommended that the patient actively go to the regular hospital to find out the specific causes, and follow the doctor’s instructions to adopt the appropriate treatment program, so as not to delay the condition.