Mal-absorption in the digestive system can be figured out from the longitudinal lines on the nails. When transverse grooves are present on the nails, they reflect either a long-standing illness or defective nutrition. In certain cases the nails assumes a prominent convex and bulbous shape like a drumstick. This condition is known as clubbing and reveals delicate heart and lungs. Concave and spoon shaped nails capable of holding a drop of water indicates iron deficiency in the body. Calcium or zinc deficiency in an individual can be inferred from the white spots present on the nails. A person having excess of red blood cells usually has undue redness on the nails whereas the one suffering from anaemia has pale nails. Jaundice or delicate liver reflects through yellow nails whereas blue nails signify a weak heart.
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