Nail Problems: What Your Nails Are Telling You About Your Health

Your nails can provide clues about your overall health. Changes in nail color, texture, or shape may be cosmetic, but they can sometimes signal underlying medical conditions. Common nail changes and their potential causes include yellow nails (may indicate fungal infection, psoriasis, or rarely thyroid disease), white spots (usually minor trauma - not a calcium deficiency), spoon-shaped nails (may suggest iron deficiency anemia), pitting or ridging (associated with psoriasis, eczema, or inflammatory arthritis), dark streaks (may be benign, but should be evaluated to rule out subungual melanoma), and brittle, splitting nails (may be caused by repeated moisture exposure, thyroid conditions, or nutritional deficiency). Fungal nail infections (onychomycosis) are among the most common nail problems in Canada. Treatment may include topical antifungal lacquers, oral antifungal medications (terbinafine is commonly prescribed), and takes several months due to slow nail growth. If you notice sudden changes in your nail colour, shape, or texture - particularly dark streaks or painful changes - consult a healthcare provider. A physician can evaluate nail concerns and determine whether further testing is appropriate. *This article is for informational purposes only.*

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated February 2026.