Is the "Crescent" on the nails have to do with health?

I often hear how the "crescent" on the fingernails can represent the health state of the body. Is this really the case? In fact, this is not an absolute ~ "Crescent" appears naturally when the nails grow. The whiter the "crescent" = the newer the nails, the more you cannot rely on this to determine the health state of the body. However, if the following situations occur in "Crescent", you must pay attention to whether there is a problem with the thyroid function, or other reasons to cause the body to be in a sub -health state. It is best to go to the hospital for a doctor. Poke the video in detail ↓