Tiny fungi can creep under your toenails and cause an infection, leading to a number of unpleasant symptoms. The American Podiatric Medical Association says signs of toenail fungus include nails that:
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* Are darker white or more yellow than usual.
* Have a strong odour.
* Accumulate debris below the surface, such as white flecks.
* Become thick and may be difficult to cut.
* Are infected and transmit that infection to neighbouring nails.
* Are painful, making it more difficult to walk.