Finger nail depression is not necessarily a manifestation of cancer, it is usually due to calcium deficiency, vitamin deficiency, or a clinical manifestation after finger trauma. 1. Calcium and vitamin deficiency: due to calcium deficiency or vitamin deficiency, which leads to malnutrition, some patients will have the clinical manifestation of sunken finger nails, which will be alleviated or disappeared after the treatment of calcium and vitamin supplementation. 2. Trauma: after trauma damage to the nails, some patients will also appear nail depression, generally need to do a good job of protecting the injured nails to avoid re-injury. 3. Cancer: Due to the lack of various nutrients, some patients with advanced cancer may also have nail depression, but it is often accompanied by discomfort at the primary site of the tumor, such as pain, low fever, emaciation and so on. It is suggested that patients should consult the doctor in time to improve the relevant examination and take corresponding treatment measures after clarifying the cause, so as to avoid delaying the condition.