How is fingernail blackening to return a responsibility

summary

Calcium is one of the main components of toenails. It's said that one's physical condition can be seen from his nails, but I don't know if it's true or false. What's the matter with his black nails? Does it show that my friend's physical condition is extremely weak? What's the matter with his black nails?

How is fingernail blackening to return a responsibility

Normal people's nails are light red, with color, no spots, and not easy to break. The edge is parallel to your flesh.

Nail blackening is the lack of trace elements, which is an indispensable part of human body. It is related to metabolism and other important physiological functions.

Nail black, there may be some physical conditions, leading to a change in character, it is recommended to go to the hospital to have a look.

matters needing attention

Nail black need to be how to return a responsibility, this should be careful, don't take health joke, physical discomfort to the hospital examination, otherwise a big mess, harm yourself, also harm the family worry.