Sometimes they don't grow fast enough, they may split or contain ridges or even white spots. Healthy nails should be pink, smooth and shiny. Changes in their color, shape and texture may signal the presence of disease. Disorders affecting the blood, such as thyroid conditions, poor circulation and heart, liver and kidney disease, can contribute to a change in nail conditon. Thickening of the Nails - insufficient oxygen reaching the nail, a sign of lung disease .
Lung disease is possible.
Broadening of the nail - a sign of possible lung disease. It's called a watch glass deformity because of the way the nail's convexity is accentuated. Vitamin A and calcium deficiencies cause dryness and brittleness of the nails. Ridging or buckling - which may be accompanied by inflammation of the skin around the nail. It's a sign of possible fungal infection.