There is a rumor that says, “If a person has half-moons on all five fingers, it means that he or she is in very good health.” Therefore, many friends often look at the crescent of the finger nail to determine the good or bad health. Is there really a relationship between our health condition and the crescent on our fingers? What kind of health condition does the number of crescents reflect? In fact, there is no relationship between our health condition and the crescent on our fingernail. Our finger nail consists of these parts: first of all, the nail is already protruding from the fingertip and is somewhat translucent; parallel to the nail, the part below it is called the nail bed; and the part at the end of the nail that cannot be seen is called the nail. Our nails are generated by keratin cells in the nail matrix, and each cell grows and ages to form the stratum corneum, which is the nail you see. So the nails keep growing upwards, and in the process of growth, why do we see some people’s nails appear crescent? The keratin cells are a light white color like a crescent when they are first created. As the keratin cells continue to age, they eventually form keratin and become the color of our nails. Why can some people see the crescent and others can’t? This is related to the methyl group hidden at the end of the finger, the part that cannot be seen, some people’s methyl group is more forward, keratin cells in the growth of the keratin cells can be seen very fresh, not yet aged keratin cells; some people’s methyl group is more backward, all the keratin cells in the visible time is no longer fresh, see is already grown nail, this is why some people’s fingers can see the half-moon and some This is the reason why some people can see half-moons on their fingers and others can’t. However, it is important to note that if you suddenly notice an increase or decrease in the number of lunulae on your fingers, especially if they increase, you should pay attention to your body, as there may be a risk of hyperthyroidism. Because our metabolism suddenly accelerates, it may be related to hyperthyroidism. Of course, it is important to consult your doctor for the final determination of your health.