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 ...

Toenail fungus often starts with mild nail discoloration or lifting. It’s not usually serious, but the nails may thicken, become brittle, or fall off without treatment. Nail fungus (onychomycosis) is ...

Black toenails are usually the result of toenail injury. However, there are other things that can cause a black toenail, including fungal or bacterial infections. Most cases of black toenails aren’t ...

Treat thick toenails by addressing the underlying cause, like wearing well-fitting shoes or using antifungal medications. Proper foot hygiene, including keeping toes clean and dry, can help prevent ...