When the nails are thick, strong, soft and very shiny, then Kapha predominates. Longitudinal lines on the nails indicate mal-absorption in the digestive system. Transverse grooves on the nails may indicate the presence of long-standing illness or malnutrition. Yellow nails indicate a delicate liver or jaundice. Blue nails are manifestation of a weak heart.
Undue redness shows an excess of red blood cells.