Depressed lines indicate that nail growth is inhibited. In other words, this grain is caused by the lack of nutrients that provide nails for finger growth. It takes four months to cut the nails out of the meat. The geographical position of the lateral folds in the nails corresponds to the passage of time.
For example, I have a bad cold. During this period, the physical fitness is weak, and the nails stop growing or differentiate weakly. When I got over my cold, my nails recovered and grew. The fever and cold during this time have left concave ripples on my nails. Four months later, the fingers grew ripples and were cut off.
The ripples on your toenails can also be induced. For example, unreasonable shoes on the feet hinder the blood circulation system or block (squeeze) the indoor space where toenails grow, leading to poor differentiation of toenails. There is blood under your toenails in the photo, which shows that your shoes often can't walk with your toes, and it is common for your toes to have lateral ripples.
Transverse ripple is a transformation that matches the health condition of the body. The longitudinal stripes correspond to the change of the mechanism of the differentiation and growth of the nail stratum corneum. For example, after hitting the nail with a hammer or making a deep cut, it is very likely to cause permanent longitudinal lines. The essence is that the structure of differentiated nails has been permanently damaged.
A few inconspicuous vertical lines are the natural lines of nails. In addition, it is not a serious illness or disaster, and it is not obvious that there are vertical stripes on the nails. That finger is different from another finger. There is a huge amount of data about the meridian theory of traditional Chinese medicine and the physical and mental health transformation of related viscera. This secret and transformation need not be explained in detail.