What should you know about thick toe nails causes?

Fungal nail disease may cause a nail to become thick, brittle, yellowish, crumbly, or partly separated from its bed. [Nail Fungus](/conditions/nail-fungus/) is one possible explanation, but appearance is not enough to prove it. [Nail Psoriasis](/conditions/nail-psoriasis/) can produce thickening, pits, discolouration, or lifting and may occur with psoriasis elsewhere on the skin.

Repeated pressure from tight shoes, running, or an altered walking pattern can injure the nail and change its growth. A clinician may ask whether one or several nails are affected, inspect the skin, and take a nail sample when infection is suspected.

Wear shoes with enough room for the toes, keep feet dry, change socks when damp, and trim nails straight across after softening them. Do not dig under the nail or share clippers. Treatment depends on the cause: antifungal medicines may be considered when fungus is confirmed, while psoriasis or pressure needs a different plan. [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/) and [Laser Treatment For Nail Fungus](/treatments/laser-and-energy/laser-nail-fungus-treatment/) are options to discuss when fungal disease is diagnosed.

Book an assessment if thickening persists, affects walking, spreads to other nails, or comes with pain or skin scaling. Seek prompt care for warmth, swelling, pus, fever, a dark streak that changes, or a nail that lifts after an injury. People with diabetes, reduced circulation, or reduced sensation should arrange foot problems early.

What cause fits the nail pattern? Is a sample needed? Could my shoes or walking mechanics be contributing? Which treatment is suitable for my health history, and how will we tell that new nail growth is improving?