Vertical lines on the nail cover are usually due to longitudinal ridge of the nail, which is mostly related to poor living habits, nutritional deficiencies, chemical irritation and increasing age. 1. Poor living habits: If there are problems such as frequent late nights and excessive stress, it will cause the patient’s nail area to have obvious vertical lines. This is a phenomenon caused by endocrine imbalance due to poor living habits or mental stress. 2. Nutritional deficiencies: When a person is deficient in iron, calcium and trace elements, the phenomenon of visible vertical lines on the nail area will occur. It is recommended to increase nutritional intake to ensure adequate intake of calcium, zinc, iron and other elements, which can be alleviated. 3. Chemical stimulation: If the patient has the habit of long-term manicure, it will cause the phenomenon of longitudinal ridge of the nail to be more obvious. In this case, you can stop using nail polish for manicure to achieve the purpose of relief. 4. Increase in age: when the age of people gradually increase, the body metabolism, endocrine level has decreased, then there will be the phenomenon of vertical lines on the nails, which is a normal situation. Nail cover with vertical lines may also be caused by other reasons. When the nails appear vertical lines, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, to give symptomatic treatment.