Causes
Learn where you’re most at risk of contracting nail fungus

Causes
Nail fungus flourishes in damp environments

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What is nail fungus?

Nail fungus is caused by different types of tiny living cells called “microscopic organisms.”

Nail fungus is caused by tiny living cells called microscopic organisms

These microscopic organisms:

  • Can survive without sunlight.
  • Flourish in warm, moist environments such as swimming pools and showers.
  • Can penetrate your skin through tiny visible or invisible cuts or through a small space between your nail and nail bed.
  • Cause problems when your nails are persistently exposed to warmth and moisture — conditions that promote the growth and spread of fungi.

Why are toenails more affected than fingernails?

Toenails are often trapped in an environment that is ideal for the production of fungi — the inside of your shoes.

Risk factors