What is this pain on the soles of my feet? Falling arches?

Pronation, fasciitis. Flat feet or "fallen arches" can put excessive strain on the joints and soft tissues of the foot. The most common condition is an inflammation called plantar fasciitis. Usually there is more pain stepping out of bed in the morning and after periods of rest. Orthotics, achilles tendon stretching exercises and cortisone injections can help.