Check your shoes to make sure you've got a comfortable fit. Click here for simple self-care suggestions. Blackened toenails are common and painful, and are caused when your big toe hits the front of your shoe. Keep your toenails neatly trimmed and filed. Check your shoe size and wear double socks on the smaller foot if the shoe is too loose.
Most people have one foot that's larger than the other.
Always buy your walking shoes for the larger foot. Your feet should be hip-width apart. Place your hands on your waist. Slightly bend your knees. Shift your weight back onto your heels and lift your toes off the ground.