This information is worth a thousand dollars, and it have been and will continue to benefit every person who will become aware of it. Clare-fully give it a read and examine your own fingernails. This is the best and most informative I can bring to you today.
Warning Signs and alerts your FingerNails might be giving you
Your nails can reveal about your overall health issues.
Many serious health issues along with serious problems in lungs, liver and heart can be seen and detected early through your fingernails. All the hidden secrets about your nails are revealed over here:

PALE NAILS:
Although pale nails are many times linked with ageing but it could also be an early sign of few serious illness like Anemia, Liver Disease, Malnutrition, Congestive Heart Failure and Diabetes.
Pale Nails

WHITE NAILS:
If your nails are are mostly white but also have darker rims then it could be an indication to a liver problem, like Hepatitis or Jaundice.
White Nails

Yellow Nails:
In most of the cases yellow nails are caused due to a fungal infection, and as the infection becomes worse, the nail crumbles and the nail bed. In very rare cases, having yellow nails can also be a result of a very severe issue like like Psoriasis or Thyroid.Disease.
Yellow Nails

Bluish Nails:
It can be due to the fact that your body may not be getting adequate oxygen, which could be due to a lung infection like Pneumonia.
Bluish Nails

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RIPPLED NAILS:
If the nail surface is rippled of the tip, it may be an early sign of ailments like Inflammatory Arthritis or Psoriasis (it is a skin ailment which starts from the nails in almost 10% of the cases)Rippled Nails

CRACKES AND SPLIT NAILS:
Brittle dry nails which split or crack often, have been considered to be a signal of Thyroid Disease. Splitting or Cracking together with yellowish hue is caused because of fungal infections.Cracked and Split Nails

PUFFY NAIL FOLD:
When the skin surrounding the nails gets puffy and red, it might be caused due to the result of a connective or lupus tissue disorder. This case is know as inflamation of nail fold.
Puffy Nail Fold

DARK LINES UNDERNEATH THE NAILS:
They should be taken care of as soon as possible. Sometimes this is caused due to Melanoma, and it is a very dangerous form of skin cancer.
DARK LINES BENEATH THE NAILS May Be Due To Melanoma

GNAWED NAILS: GNAWED NAILS
Nail biting for you may only be old habit for you, but in few cases it is proved to be a sign of Persistent anxiety which could corrected with the help of a proper treatment. Nail biting habit have also been linked to Obsessive compulsive disorder. In such cases contacting your doctor could prove to be of great help.

So take this information very seriously, because this can help you in need and reveal a hidden ailment which you might have been neglecting otherwise, and help you to recover it in the beginning itself.