Ideally, the nail surface should be free of longitudinal and horizontal grooves. Therefore, once you notice that its surface has become rough, lusterless, or even has visible longitudinal stripes and feels grooved to the touch, it may mean that your body is in a state of fatigue lately and as a result, it is weak, with constant mental fatigue and reduced immunity. In addition, vitamin or trace element deficiencies can also lead to streaky vertical lines. If these vertical lines appear on the nails below, pay extra attention! There are vertical lines: poor digestion, malnutrition, calcium deficiency Many people have either dense or sparse prismatic vertical lines on their nails. This condition, if it appears for a short time and will disappear soon, is usually due to overuse of the brain, too much work and lack of sleep. Solution: You should try to get more time for rest at this time. If the vertical lines persist, it may be a chronic pathology of the internal organs. The first is poor digestive system function and poor nutrition. Other experts believe that the ribs on the nails may be a decrease in the body’s immunity caused by a lack of calcium. In addition, some people have horizontal lines on their nails, which in most cases are naturally generated when they are sick. The solution: if the vertical lines are small, it does not matter much, just pay attention to a regular diet and balanced nutrition. Black vertical lines: weak liver and kidneys, toxins in the body If there are black vertical lines on the fingernails, it may be a sign that the liver and kidneys are weak and toxins are hosted in the body. Solution: Eat more liver and kidney foods, such as high protein foods, fish and seafood, soy products and dairy products. Blue vertical lines: lung infection or pneumonia If the vertical lines are blue, it means the body is lacking oxygen, which may be a sign of lung infection such as pneumonia. Solution: Eat more lung-nourishing foods, such as balsam pear, grapes, pomegranate, radish and silver fungus. Vitamin A deficiency can also lead to a significant increase in fingernail vertical lines, when you can eat more food containing vitamin A, such as: pears, apples, loquats, bananas, cinnamon, apricots, lychees, watermelon; horsetail, cabbage, capers, tomatoes, eggplant, pumpkin, cucumber, spinach; mung beans, rice, walnuts. How to manage vertical lines on the nails? Pay attention to a good routine, in addition to through dietary therapy, eat a diet rich in high-quality protein. Such as milk, eggs, beans, fish, etc., and take vitamins, as well as zinc, iron, calcium and other trace elements to adjust body functions, the vertical lines on the nail surface will gradually disappear. Soak your fingers in vinegar diluted solution every night, which is a good method to prevent nails from splitting easily. White iodine used on the top of the nail and under the tip of the nail not only restores the ease of bending and strength of the nail, but also has the effect of preventing the nail from being cut off in sections. Two tablespoons of yeast and 1000 mg of choline should be taken orally daily. It is best to take these nutrients internally in fluid or milk as this will help improve the strength of the nail. Soak faceted, unblemished nails in warm malt oil or other natural oils for about 5-10 minutes daily. Then massage from the fingertips towards the surface cuticle. If an emery board is used to lightly abrade the nail surface, it will allow the oil to penetrate more easily. Since iron deficiency can cause dry, brittle nails, it is best to eat iron-rich foods. It is also important to consume vitamin C to improve the absorption of iron.