There are several reasons why there are black vertical lines on the nails: 1, it may be brought about by congenital genetic factors, you can go to your family to see if the elders have a similar situation, if it is hereditary can not be dealt with for the time being, if there is no significant increase in the black vertical lines, you can continue to conservatively observe. 2, because of the lack of minerals in the body, such as zinc, calcium, phosphorus, iron, etc., the emergence of such a situation should be aware of the coordination of diet, while the appropriate amount of supplemental minerals can be more effective in relieving the symptoms. The same time, moderate supplementation of minerals, can be more effective in alleviating the symptoms. 3, the emergence of nevus of the mother of nails, if you find that the symptoms of the black vertical lines in the increasing, it is recommended to go to the hospital to deal with, must be surgically removed, sent to the pathology examination, in order to prevent the further spread of the disease. 4, nails are traumatized, due to the nails of the bruises caused by the nails, we must actively deal with the wounds of the trauma, and at the same time, to the protection of the nails.