What Deficiency Causes Dips in Nails? The Truth About Ridges and Pitting
                                
                                
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                                    4 min read                                
                            
                                According to the Cleveland Clinic, one of the most common causes of horizontal grooves or depressions known as Beau's lines is a severe zinc deficiency or malnourishment. When considering what deficiency causes dips in nails, it's crucial to distinguish between different types of nail abnormalities and their specific underlying causes.