Pain in the bottom of the heel is common complaint in runners. Actually, heel pain is common in all people. 40% of all visits to podiatrists in the U.S. are because of heel pain. Of all of the different causes of heel pain, the vast majority is due to a condition known as plantar fasciitis. This is the most frequent cause of pain on the bottom of the heel and is an inflammation in the band of tissue (the plantar fascia) that runs from the heel to the toes. This condition is most often caused by a tight achilles tendon or poor foot structure such as overly flat feet or high arches. It can also be caused by wearing non-supportive footwear on hard surfaces, spending long hours on your feet, or obesity.
Your running biomechanics are unique to you. No one has your fingerprints, personality, or running style. Running more efficiently with custom orthotics can conserve energy and get you to the finish line faster, but… not everyone needs custom orthotics.