With warm, summerlike weather already here, many of us have traded out our shoes for sandals or flip-flops. With the increase in activity for many, and the shift to a shoe type that provides less support, there can be an increase in foot problems. One of the most common types of foot problems is heel pain. One in 10 of the U.S. population that will suffer from heel pain at some point.  Though there are many causes, heel pain falls into five common diagnostic areas, according to Dr. Stephen L. Barrett of Innovative Neuropathy Treatment Institute in Phoenix.