2. Observe the crescent shape of nails. Normal nails have crescent moon, which is called half moon mark. This is the storage of protein representing the body. Generally, the crescent moon accounts for 1/5 of the whole nail. If the half-moon sign is less than 1/5 or greater than 1/5, it is abnormal. If it is less than 1/5, it means that the protein in the body is insufficient and the gastrointestinal tract is weak, so protein needs to be supplemented. If it is greater than 1/5, it means that the myocardium is enlarged and it is easy to suffer from cardiovascular and cerebrovascular diseases. Therefore, the new moon is called a "barometer" of human health.
3. Observe the texture of nails. If you look carefully, the surface of a healthy nail is very smooth and almost no texture can be seen. However, if horizontal or vertical texture is found on nails, it is a signal from the body. If vertical stripes appear, it means that the human body is declining, and the respiratory system and nervous system may be diseased. If there are striations, it indicates the beginning of dangerous pathology. Generally, the horizontal stripes are only exposed at the bottom of nails, and gradually move up with the growth of nails. When you see such stripes, you must pay attention. It is recommended to go to the hospital for examination. It usually suggests intestinal infection and pneumonia.
4. Observe the spots on your nails. There are no spots on the surface of normal and healthy nails. If there are spots on the nails, it means some kind of disease. If there are too many white spots on the nails, it is a sign of neurasthenia. If there are yellow spots, you have digestive system diseases.