15 Health WARNINGS Your Fingernails Are Sending NEXT PAGE Horizontal Ridges or Grooves in Nails Beau’s Lines are horizontal grooves in your fingernails that can be an indication of Diabetes or nutritional deficiencies. Wait until you see what yellow nails are a sign of are on the next page… shocking!!! About Dr Oz Fans Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Current ye@r * Leave this field empty Sign up to our newsletter! Human Verification: In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.