Vertical lines on the nails are not necessarily a disease, but may also be a normal physiological phenomenon, and should be analyzed on a case-by-case basis. Vertical nail lines are most common in physiological phenomena, when the texture of the nail does not change, as the nail grows older, longitudinal lines will appear. In addition, vertical lines on the nails can be seen in nail dysplasia, anemia, malnutrition, etc. Mild nail dysplasia is characterized by scattered vertical lines on the nails, the texture is shallow and difficult to distinguish without careful observation, while severe cases show rough texture on the nails, vertical lines are more obvious, the nails grow in different directions between the vertical lines and appear misaligned. Patients should strengthen nutrition, avoid picky eating, eat more vitamin-rich food, supplement trace elements, if the symptoms are more serious, you can go to the hospital dermatology department for treatment.