This condition is mostly considered to be caused by the patient’s anemia or the patient’s frequent malnutrition, resulting in the lack of substances needed for the growth of nails, which will show this symptom on the nails. So the patient needs to replenish the blood and nutrients in time. Of course, it may also be because the patient is infected with gray nails, you can first go to do a fungal microscopy to rule out. If the middle position of the patient’s nails has been hit, this situation can also occur. So usually pay attention to protect the nails, cut the nails diligently, do not use the nails to contact corrosive substances.