I have a sore and burning sensation on the bottom of my feet in the metatarsal areas. i can walk well on carpet, but not so well on hard surfaces.

Metatarsalagia: Several factors may cause metatarsalagia. As we age the plantar fat pad beneath the metatarsals begin to thin and atrophy. Try gel insoles in your shoes... There is no treatment available other than comfort ..,

Neuroma: Burning in the feet can be caused by diabetes or vitamin deficiencies. Also it can be caused by a neuroma which is a pinched swollen nerve in the ball of the foot.