Don’t underestimate the nail, the dermatology clinic to see the nail disease accounted for one tenth of the patients, not to see more, nail disease in the majority of nail fungus that is nail fungus commonly known as gray nail, mainly due to fungal infection. This affects the image, if not look after, will gradually increase, so that the fingers and feet fingers are infected, another common is nail dystrophy, nail uneven no luster, brittle cracked soft. This is related to nutritional metabolism and micronutrient and vitamin deficiencies. There are different treatment options for both of these nail diseases. The more common concern is the lunula. A currently popular method of determining physical health. Is it related to physical health? Almost everyone has heard the saying that the more crescents on both hands the healthier you are and vice versa, the worse your health is, is this true? The nail’s crescent is actually a new growth of keratin The scientific name for the nail’s crescent is called the half-moon mark, also known as the half-moon white, underneath which is responsible for the production of nail “nail matrix”, commonly found in the thumb, but other nails are covered by the nail guard skin and less common. We all think that the nail is hard and strong, but its composition is actually keratin, and there is a part called “nail matrix” at the junction of the flesh and the nail plate, which is responsible for producing new keratin and transporting it out so that our nails can grow properly. The newly created keratin is as white and full as a newborn baby, and when it has gone through the ups and downs of life to the outside world (when the nail root becomes the official nail plate), it becomes hard and translucent, protecting the delicate nail bed below. The nail matrix produces keratin at the fastest rate in the middle and slows down to the sides, but they all become translucent at the same time, so they form this curved white border, which we call the crescent. The size of the crescent has little to do with health in general. If your nail matrix grows backwards, or if the epithelium (the layer of skin covering the nail root) is thicker, or if the nail growth rate is naturally slower, your crescent will not show. It is not that the more and bigger the crescent means the better your health. But the number and size of the crescent moon changes dramatically to be careful of thyroid problems! Although you can’t know your health just by your moon teeth, if in a very short period of time, the moon teeth on your hand change from none to many and large, or if the moon teeth that were there disappear quickly, you really need to check your thyroid gland! When the thyroid gland is hyperactive, the whole body’s metabolism takes off with the increased thyroid hormones, and the nails grow rapidly as a result, and the nail guard does not cover them completely, so your little white crescents come to the forefront and your crescents become bigger and more numerous. Hypothyroidism is the opposite of hyperthyroidism, in hypothyroidism a person’s metabolism becomes very slow and the nails grow very slowly. The nails tend to be more likely to be completely covered by the nail guard, and the original crescents will become smaller or even absent. In addition, malnutrition and ageing can slow down the metabolism and make the crescent teeth less and even disappear. So if the change is not drastic, you don’t need to worry too much. Reminder: Most people have no problem with small symptoms on their nails, but if the changes are drastic or you are not sure what the cause is, ask a professional dermatologist, don’t ignore the real distress signal from your body.