Does an underactive thyroid cause nail fungus?
On One Hand: Hypothyroidism Not Linked to FungusHypothyroidism, which occurs when the thyroid gland is under-active, does not lead to fungal infection of the nail. However, hypothyroidism may cause the nails to become thin and brittle. These are symptoms similar to those of fungal nail infection, according to the Mayo Clinic and Medline Plus.On the Other: Nail Fungus Has Other CausesIn addition to exposure to fungi, some factors increase a person’s risk for developing nail fungus. Older people, men and people who have family members who have had nail fungus are at higher risk, according to the Mayo Clinic. Humidity and moisture contribute to nail fungus, as do other foot infections and nail injuries, psoriasis, diabetes, circulation problems and a weakened immune system, according to the Mayo Clinic.Bottom LineHypothyroidism does not contribute directly to the risk for nail fungus. However, it does cause brittle nails, which may predispose a person to developing nail fungus.
