Excessive nail polish use or fungal infections are the most likely causes of yellow toenails. However, yellow toenails can sometimes be a sign of a more serious underlying condition. Nails are ...

Thick, yellow, and brittle toenails are often caused by a fungal infection known as onychomycosis. This occurs when yeasts, moulds, or dermatophytes enter small cracks in the nail or surrounding skin, ...

Yellow nail syndrome is a rare disease that affects your fingernails and toenails. People with yellow nail syndrome may also develop pulmonary and lymphatic system problems. The disease is called ...

When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot. Six months later, that seemingly innocent mark led to a diagnosis that saved ...