What should you know about very thick toe nails?

A thick nail may become yellow, white or brown, crumbly, ridged, curved or difficult to trim. Nail fungus is one possible cause and may also produce debris beneath the nail or spread to other nails. Nail psoriasis can cause pits, separation or colour changes, particularly when psoriasis affects the skin elsewhere.

A past toe injury, tight footwear or repeated pressure can alter nail growth for a long time. Several conditions can look alike, so a clinician may examine the nail and sample material before recommending antifungal treatment.

Keep nails clean and dry, trim them carefully after bathing when they are softer, and avoid cutting deeply into the corners. Wear shoes with enough room for the toes and do not share nail tools. Disinfect or replace tools after use if a fungal infection is suspected.

Treatment depends on the cause and may include oral antifungal treatment or laser treatment for nail fungus. These options are not interchangeable for every thick nail, and a clinician should consider other medicines, liver health, pregnancy and the appearance of the nail before treatment.

Arrange a review if a nail keeps thickening, becomes painful, changes colour, lifts, or affects walking or footwear. Seek prompt care for redness, warmth, swelling, pus or a wound around the nail. People with diabetes, poor circulation or reduced sensation should have foot changes assessed early.

Ask whether the appearance fits nail fungus, nail psoriasis, injury or pressure, and whether testing is needed. Discuss the expected course of any oral or laser treatment, nail care during recovery, and how to reduce recurrence or spread.