Baidu said: vertical stripes: the nail surface is not smooth enough, with straight stripes, which usually appear after overwork and excessive brain use; These vertical stripes will appear obviously in the case of insufficient sleep. If vertical stripes persist, it may be a chronic disease of internal organs. If not nursed back to health, with the development of the disease, nails will become uneven and even crack.

Here are some materials I found.

First, physiological phenomenon: vertical stripes on fingernails may be normal, so don't worry too much.

Second, lack of vitamins: If the body lacks vitamin A, vertical stripes may appear on the nails.

Third, iron deficiency anemia: there are vertical stripes on the fingernails. If accompanied by this pale face, weakness, palpitation and shortness of breath, it is caused by iron deficiency anemia.

Fourth, overwork: life is always in a state of tension, and the quality of sleep is not high. The brain can't stand it naturally. Overwork can also cause vertical lines on nails.

Five, trauma: because there is a little trauma on the nail, even a small pain may leave vertical stripes on the nail. 6. Chronic inflammation: Vertical stripes on nails may also indicate inflammation of certain organs, such as renal dysfunction, enteritis and rheumatism.

Chinese medicine health experts remind: if there are longitudinal stripes on fingernails that are brown and run through the whole nail, it may suggest that enteritis is pathological, or it may suggest extreme vitamin deficiency or iron deficiency; If the vertical stripes on the nails are brown, it may be a signal of liver disease, but if there are talents on ten nails, it must be a portrayal of liver disease; If yellow-brown vertical stripes appear alone, it may indicate arthritis.