The four little words that make the world spin, “I need a manicure!” never ring quite as true as when you glance down at your fingernails and notice that all of the sudden they’re tinged yellow. Eek!

Thick, yellow, and brittle toenails are often caused by fungal infections like onychomycosis, which thrives in moist ...

Yellow nails can be caused by nail polish, smoking, and fungal infections. Medical conditions like diabetes and thyroid disorders can also cause yellow nails. If you have unexplained yellow nails, see ...