What should you know about toenails are thick and brittle?

A brittle nail may split, crumble at the edge, or catch on socks. Tight shoes, repeated impact, moisture, and picking can weaken the nail. Fungus often changes the texture and colour of a nail, while nail psoriasis can cause pits, ridges, lifting, or areas that separate from the nail bed.

The appearance alone cannot confirm the cause. A clinician may inspect the nail, surrounding skin, and other nails, then take a sample if fungus needs checking. The pattern, how quickly it appeared, and whether other body areas are affected all help guide the assessment.

Keep feet dry, change damp socks, and choose shoes that do not press on the toes. Trim nails straight across after washing when they are softer, but do not cut deeply into the corners or tear brittle pieces away. File a sharp edge gently and avoid sharing nail tools.

Do not assume every thick nail needs antifungal medicine. If fungus is confirmed, a clinician may discuss [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/) or [Laser Treatment For Nail Fungus](/treatments/laser-and-energy/laser-nail-fungus-treatment/). [Nail Psoriasis](/conditions/nail-psoriasis/) needs a different evaluation.

Book an appointment when the nail keeps crumbling, becomes painful, lifts, or changes despite gentler footwear and care. Get prompt advice for redness, warmth, swelling, pus, or a wound around the nail. People with diabetes, reduced circulation, or reduced sensation should have foot changes assessed sooner because small injuries may be harder to notice.

A new dark area, a rapidly changing nail, or thickening in several nails also warrants professional review rather than cosmetic cover-up.

Ask what features point to fungus, psoriasis, or mechanical damage; whether a nail sample is needed; and which trimming method suits your nail. Ask how to protect the toe if footwear is causing repeated pressure.