What happens to black nails?

A variety of conditions can cause black lines on the nails, so it is recommended that patients see a hospital, by professional doctors according to the specific situation of the patient, specific analysis. Under normal circumstances, if the patient has black lines on the nails is caused by lack of vitamins or iron deficiency, such a situation, it is recommended that patients can supplement vitamins, eat more fruits and vegetables, usually eat more iron-containing food supplements, or can also use external ointment to alleviate symptoms. Secondly, if there is only one black line on the patient's nail, and this black line has a tendency to lengthen, thicken and deepen the color, from the root of the nail to the top, such a situation is considered to be a large possibility of nail-nevus, it is recommended that the patient go to the hospital for relevant examination in time, and symptomatic treatment according to the examination results.