Think twice before jumping in that hot tub! The warmth and moisture of hot tubs, saunas and spas are all ideal environments for the organisms that cause fungal infections to thrive. If you frequent these places, check your nails regularly for any changes in colour or texture. Pay particular attention to your feet – toenails are seven times more likely than fingernails to become infected. If left untreated, fungal infections often spread to other nails. Infected toenails can become disfigured and turn color (yellow, gray, brown, or black). Other signs of advanced infection include brittleness and cracking, as well as separation from the nail bed. Oral and topical treatment options are available through your doctor.