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Slide show
Slide show: How to trim thickened toenails
By Mayo Clinic staff
Thickened toenails: What causes them?
Your toenails can thicken for many reasons. These include an injury; skin conditions, such as psoriasis; tight or poorly fitting shoes; and fungal infections — as shown in this picture.
Among these, a fungal nail infection — onychomycosis (on-i-ko-mi-KO-sis) — is the most common cause of thickened toenails.
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References
- Habif TP. Nail disorders. Clinical Dermatology: A Color Guide to Diagnosis and Therapy. 5th ed. Edinburgh, U.K.: Mosby Elsevier; 2010. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-7234-3541-9..X0001-6--TOP&isbn=978-0-7234-3541-9&uniqId=230100505-57. Accessed April 6, 2011.
- Nail problems. American Podiatric Medical Association. http://www.apma.org/MainMenu/Foot-Health/Foot-Health-Brochures-category/Learn-About-Your-Feet/Nail-Problems.aspx. Accessed May 10, 2011.
- Ellman MG (expert opinion). Mayo Clinic, Rochester, Minn. May 11, 2011.
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