A badge of honour for ultra-runners, black toenails are caused by blood pooling beneath the nail. The most likely cause? Very long runs in ill-fitting shoes. "There should be 1cm between the end of ...

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 ...

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 ...