First of all, the new moon on the nail is called "half moon"
The nail of the body is a transparent stratum corneum covering the fingertip, which is composed of keratin produced by the nail matrix. The newly transformed keratin is milky white, and it takes some time to become transparent. However, the productivity of keratin from matrix A is different. The production speed in the middle is faster, and it will gradually drop to the edge, forming a semi-arc gray-white area, commonly known as "half moon".
The first month and a half are newly transformed nails, which will promote the outward growth of old nails. The daily growth is about 0. 1mm, which is faster in summer and slower in winter.
Second, why is the size of the first half month different?
From the point of view of modern science, the factors that harm the total number and size of half moon are related to the position of nail matrix and the conversion rate of keratin, which has great individual differences. The key is related to my genetics, but it has little to do with my health. Old people, or people who lack nutrition, the growth rate of nails will slow down and shrink in a month and a half.
The first month and a half is also related to the activities of hands. People who usually work more will grow their nails faster, and they will be bigger and more in the first month and a half, while people who usually have less activities with their hands will grow their nails more slowly and less.
Generally speaking, the thumb is much used in daily life, and the nails grow fast, which will be bigger in one and a half months, and the little finger will be smaller in one and a half months. Violin artists, computer operators and other people who must have a common thumb may be a little older in a month and a half, it doesn't matter.
3. Is half a month related to physical and mental health?
In general, the shape of nails is different for everyone, just like everyone's appearance and figure are different, which has little correlation with physical and mental health. Only when there is a mutation in the first half of the month can there be health problems.
The occurrence of severe feeling (such as onychomycosis), or nutritional deficiency and hypothyroidism will cause nail growth retardation, leading to sudden atrophy or regression in the first half of the month. If it suddenly rises in the first month and a half, it means that the basal metabolism becomes faster, which is more common in patients with hyperthyroidism.
Vertical stripes on nails have nothing to do with physical and mental health. They are usually not significant when they are young, but very significant when they are old. The basic principle is the same as wrinkles on people's skin when they are old, and it is not a matter of physical and mental health.
In patients with respiratory, pulmonary and cardiovascular diseases, the finger-tail mechanism is in an acute and chronic hypoxia state, which is easy to produce clubbed fingers, which leads to the change of nail shape. Trauma can lead to skinny nails.
To sum up, the "small crescent" on the nail is called half moon, and its total number is related to the size of each person's own physique, but has nothing to do with physical and mental health. Only when there is a mutation in the first half of the month can there be a problem with physical and mental health. At this time, it is the most appropriate choice to see a doctor at once.