Finger nails with vertical lines may be caused by nail malnutrition, trauma, disease factors and other reasons. 1. Nail malnutrition: The lack of trace elements, especially iron, zinc and calcium, may cause nail malnutrition and the phenomenon of finger nails with vertical lines. 2. Trauma: If the fingernail is smashed or squeezed by heavy objects, the nail bed is damaged, and the shape of the nail changes during the growth process, which can lead to vertical lines on the fingernail. 3. Disease factors: some diseases may also cause nail changes, such as lichen planus, psoriasis, rheumatoid arthritis, etc., which may have an impact on the growth of nails, resulting in fingernails with vertical lines. Finger nails have vertical lines with a variety of factors, it is recommended to timely to the hospital for examination, clear cause, follow the doctor’s instructions standardized treatment.