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What causes toenail fungus?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Walking on moist surfaces is one cause of nail fungus.

Watch the video to learn more from Dr. Oz about what causes nail fungus.
James P. Ioli, DPM
Podiatric Medicine
The moist, dark environment inside your shoes provides a perfect habitat for fungi. These simple plantlike organisms don't require sunlight. They also thrive on keratin, one of the proteins in toenails. Fungi are common, so it's easy to come in contact with them. Infections are normally spread in damp areas where many people congregate -- such as swimming pools and gyms, or even the shower or tub in your own home, if someone who uses it has the problem.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.