By Ahmed Abdelsalam
Runner's toe, a common condition among distance runners, involves bleeding under the toenail that can lead to nail loss, but doctors say it is treatable and preventable with proper care and footwear adjustments.
What Is Runner's Toe?
Medically known as a subungual hematoma, runner's toe appears as red, purple, or black discoloration under the nail bed and may cause throbbing pressure. It most often affects the longest toe and can eventually cause the nail to fall off. While associated with running, anyone wearing poorly fitting shoes can develop it, and sudden trauma from dropping an object on the toe warrants a doctor visit to rule out a fracture.
Causes
Repetitive trauma from downhill running, high mileage, shoes that are too loose or too tight, long toenails, and heat or moisture buildup increase friction and pressure between toes and footwear. This forceful contact ruptures blood vessels in the nail bed, allowing blood to collect under the nail plate.
Treatment Options
Treatment varies by severity. If the nail remains intact and painless, it typically resolves as the nail grows out. When the nail partially or fully detaches, doctors recommend cleansing the toe with saline, trimming only loose edges to prevent snagging, applying a topical antibiotic ointment, and covering the exposed nail bed with a non-adherent bandage changed daily. Silicone toe sleeves can protect healing nails during runs, and loose nails should be allowed to fall off naturally.
Prevention Strategies
Experts emphasize properly fitted shoes — professionally measured at day's end with at least a thumb's width of space beyond the longest toe. Moisture-wicking socks reduce friction and sliding, while a runner's knot lacing technique locks the heel in place. Keeping toenails short and smooth with quality clippers and a glass file minimizes jamming against the shoe front.
Frequently Asked Questions
Toenails take 12 to 18 months to fully regrow, and nothing accelerates the process. Running with mild to moderate cases is acceptable if the underlying cause is corrected. Pedicures are safe only when no nail bed is exposed. A doctor should be consulted for severe pain, signs of infection, diabetes or circulation issues, inability to move the toe, or persistent discoloration.
Expert Sources
Advice comes from Dr. Jacob Wynes of the University of Maryland School of Medicine, Dr. Kristin Hullings of Temple University's Lewis Katz School of Medicine, and Dr. Rull James Toussaint of the University of Florida College of Medicine.
