If the body is cold and heavy, the blood flow will become slow and stagnant, and the blood will not easily reach the limbs, skin and other human ends, which will cause cold hands and feet, dull skin color and easy to grow spots and wrinkles. Cold in the body can also cause digestion and absorption of the gastrointestinal tract and reduce the growth of blood. Home is also the tip of the human body. If qi and blood are not smooth or insufficient all the year round, it is impossible to generate a half-moon shape under the nails. So this half-moon shape can not only judge the severity of cold and dampness in the body, but also judge the blood volume in the body.
Generally speaking, the half-moon shape of healthy thumb should account for 1/4 of the whole nail. Except the little finger, other fingers should also account for 1/5~ 1/6. If only the thumb is half-moon, it means that the body may be cold. If there are no half-moons on the five fingernails, it means that there may be a bad cold in the body, poor nutritional status, and little and thin blood.
Others have too big a half moon on their nails. This kind of person is in good health when he is young, full of blood, angry, big appetite, not afraid of cold, active and tireless. When people reach middle age, they tend to be irritable and have high blood pressure because of excessive internal heat. They are also particularly greedy for cold, which is more likely to cause severe cold in the body and blockage of meridians. They are often characterized by yin deficiency and fire, and are prone to diabetes and hyperlipidemia.