Nails can reflect a person's recent physical health:
Purple nails suggest insufficient blood supply, hypoxia, arteriosclerosis and hyperlipidemia (high cholesterol).
People who are close to death, their nails often turn black from the fingertips of the roots, grow into a straight line and die in the air.
Blue nails lack oxygen. Too blue, congestion, or cardiac arrest are all malignant lesions of nails.
Blue nails are severe cold syndrome and blood stasis. Blue and black are in critical condition.
Yellow nails are jaundice, hepatobiliary diseases and smoking addiction. It is a chronic disease, which appears on the thumb, suggesting that the whole body is in poor health.
White spots on nails indicate calcium deficiency, silicon deficiency or parasites. Drug or nicotine poisoning can also cause white spots. People with white nails are prone to fatigue or chronic habitual constipation. The white shift of the middle finger suggests that the spine is calcium deficient and osteoporosis, which is prone to waist and leg diseases or fractures and should not be repaired.
There is a milky arc area at the root of a person's nail, commonly known as "half moon". Its size generally accounts for one-fifth of the nail, the thumb is the largest, the index finger is the second and the little finger is the smallest. People with this standard form show that their health is generally good.
Fingers can't see "half moon": most of them have some problems in the circulatory system, which are easy to neurasthenia, anemia and low blood pressure.
"Half-moon shape" is too large to exceed one-fifth of nails: it means that the heart is overloaded and prone to cardiovascular diseases.
"Half moon" is too small: it is easy to suffer from asthma, gout, pneumonia and gastrointestinal diseases.
All four fingers are "half-moon-shaped", but the thumb is missing: it means that you are weak and prone to illness.
There is no "half moon" on all four fingers, but the thumb has: it means that you are healthy, so don't worry. If the "half moon" turns blue, it means that the heart is sick.
If the "half moon" suddenly shrinks and disappears, it means that you may be seriously ill and should go to the hospital immediately.
People with short nails have weak hearts and are prone to infection from the abdomen to diseases in the waist and lower body. If these nail tips are flat and embedded in meat, diseases such as neuralgia and rheumatism may easily occur.
People with narrow nails, ridges and other bones are prone to get sick, especially those with very soft nails, and calcium is always very scarce.
People with crustaceans should pay more attention to minor problems in the spinal cord and nervous system.
Too many white spots on nails are symptoms of neurasthenia, and yellow spots indicate digestive system diseases. Small particles on nails are drug poisoning or parasites in the body.
If the half-moon shape at the lower end of the nail is large, it means that the blood circulation is fast. If it is small, it means that the blood circulation is not good. When it comes to extreme anemia, it disappears completely in half a month.
There is a straight line on the nail, which is proof of overwork and overuse of the brain.