Sometimes your nails may grow different or become deformed. It is possible due to an Iron deficiency which will cause your nails to become spoon shaped. Your nails may become clubbed, swelling around the ends of your fingers and sometimes your toes if you have a respiratory or heart problem. If you have psoriasis your nails may become pitted. Vertical ridges occur to your nails becuase as you get older mal absorption of Vitamins A, B complex and C, and also calcium, magnesium, zinc and other essential fatty acids.