14/06/2026
Think that thick yellow toenail is definitely a fungal nail?
Not always.
Thick toenails — medically known as onychauxia or onychauxis — can be caused by fungus, but they can also be caused by a range of other things.
That is why treating a nail with anti-fungal protocols for month on end without testing it first can waste time and money.
In our latest article, we take a detailed look at:
• Nail anatomy
• Why toenails become thick and hard
• The difference between onychauxia and fungal nails
• When a thick nail may be caused by pressure or trauma
• Why diabetic and high-risk feet need extra care
• When a thick nail should be checked properly
• Treatment options from a podiatry perspective
If you or someone in your family has a thick, painful, yellow, curved or difficult-to-cut toenail, this article is worth reading.
Onychauxia, also called onychauxis, is abnormal thickening of the nail plate. Learn why toenails become thick, yellow, painful or difficult to cut, and why not every thick nail is fungal.