What should you know about thick fingernails and toenails?

A thick nail may grow more slowly, become yellow or cloudy, curve, crumble, or separate from the skin beneath it. Nail fungus often affects one or more nails and may bring discoloration or debris. Nail psoriasis can cause pits, lifting, or changes in several nails and may occur with psoriasis elsewhere. A stubbed toe, tight shoes, or repeated hand trauma can also alter the nail as it grows out. These patterns overlap, so a clinician may inspect the nail and sample material before choosing treatment.

Keep nails clean and dry, change damp socks, and choose shoes with enough room at the toes. Trim straight across with clean tools; do not dig into the corners or aggressively scrape underneath. Avoid sharing nail clippers and avoid covering a changing nail with polish until it has been assessed. A clinician can distinguish fungus from psoriasis or trauma. Depending on the finding, options may include treatment for Nail Fungus, Laser Treatment For Nail Fungus, or Oral Antifungal Treatment.

Arrange an assessment if thickening persists, spreads to other nails, returns after treatment, or makes shoes or daily tasks uncomfortable. Seek prompt care for redness, warmth, swelling, drainage, significant tenderness, or a wound around the nail. A new dark streak, pigment extending onto nearby skin, unexplained bleeding, or a nail that lifts without a clear injury also deserves timely review. People with diabetes, reduced foot sensation, poor circulation, or a weakened immune system should arrange care early for foot or nail changes.

Ask whether the nail needs a fungal test, whether another nail condition fits the pattern, and which treatments are suitable for your other medicines and health conditions. Mention when the change began, any injury or footwear pressure, other affected nails, and whether the skin is itchy or scaly.