Thick yellow toenails are usually caused by a fungal infection called onychomycosis. This can be irritating or painful. It’s less common, but the infection can affect your fingernails as well. Thick ...

Yellow toenails should never be ignored. They're most often caused by a fungal infection that's contagious and hard to eliminate without proper treatment. You can also develop yellow toenails as a ...

Common causes of yellow toenails include excessive nail polish use and fungal infections. However, yellow toenails can sometimes be a sign of a more serious underlying health condition, such as ...