What should you know about thick crumbly toenails?

A fungal nail may become yellow or white, thick, brittle, and prone to debris beneath the edge. Nail psoriasis can cause separation, ridges, pits, or uneven growth, with or without skin plaques. Repeated pressure from footwear or an injury to the nail root can also leave a thick, irregular nail as it grows out. A clinician may need the nail history and, sometimes, a sample to separate these causes.

Keep nails short with clean tools, file only rough loose edges, and dry carefully after bathing. Wear breathable shoes with enough toe space and rotate footwear so it can dry. Do not share nail instruments or use aggressive scraping. Avoid covering a suspected infection with cosmetic products until it has been assessed. Nail Fungus and Nail Psoriasis provide useful background, while treatment choices may include Oral Antifungal Treatment or Laser Treatment For Nail Fungus.

Arrange an appointment when the nail remains crumbly, several nails change, or footwear and walking become uncomfortable. Seek prompt care for pus, spreading redness, warmth, swelling, or significant pain. A new dark mark, bleeding without clear injury, or a sore that does not heal should be examined. People with diabetes or poor circulation should not delay foot assessment.

Would a nail clipping or other sample clarify the diagnosis? Could psoriasis or old trauma explain the texture? Which treatment is suitable with my current medicines, and how should I care for the nail while it grows?