What's going on inside your fingernails?

Empty nail, may be due to malnutrition, lack of certain elements or trace elements in the body, resulting in effective synthesis of nail formation substances can not be effectively synthesized, resulting in nail showing pits, may also be caused by trauma nail damage, in addition, due to the skin on the nail due to fungal infection caused by formaldehyde poisoning, serious cases can show nail loss, it is recommended to go to the hospital for examination, clear reasons, symptomatic treatment.