The Kerr House
Though fancy nails are in vogue now, fingernails have been used in the past as a diagnostic tool.

A large moon may suggest an overactive thyroid, and no moon may suggest the thyroid is under-active. A predisposition to heart disease might be recognized in a poorly formed moon. If it is slightly blue, it might represent cardiovascular or respiratory problems.

Nails that chip, peel, crack or break may be a symptom of insufficient HCL, protein, and/or minerals. Lack of vitamin A and calcium can cause dryness and brittleness, while B deficiency can cause curved nail ends and dark nails. Hangnails may be linked to vitamin C deficiency.

The color should be a lighter shade than your skin color. If the nail is red (and it has no polish on it), work on improving your circulation. If pale, check your iron. Discoloration could be a clue about your health. Spots, blemishes, or white spots can indicate a nutritional imbalance.

Vertical ridges may indicate the possibility of rheumatic conditions, while horizontal ridges could mean a nutritional deficiency. Fungus can form under nails if there is insufficient lactobacillus (as in yogurt).

If the nail is concave, it could indicate a chemical imbalance from nutritional deficiency. If convex, it could suggest respiratory problems. Interesting isn't it? What do your nails tell you?