Ridges On Nails in Related Issues & Disorders Posted October 2, 2009 · Report to Admin Hi, I have been gluten-free/CF free since August of this year. I have just noticed I have vertical ridges on my fingernails. I have heard this could be from a calcium deficiency. Any ideas? I otherwise feel good since eliminating the gluten-free/CF from my diet. My understanding is that nail ridges (vertical) are from psoriasis. I was diagnosed with psoriasis many, many years before I was diagnosed with Celiac. Interesting that both are autoimmune!