title: I'm 76 and an avid walker. Lately, though, I've noticed a burning sensation and pain on the ball of my foot when I walk or stand--it's even worse if I'm barefoot or in socks. It feels like I'm walking on pebbles. The pain goes away when I'm off my feet. What might cause this?
mesh_terms: D006801:Humans; D008682:Metatarsal Bones; D037061:Metatarsalgia / Q000175:diagnosis* / Q000517:prevention & control*; D016138:Walking; D016474:Weight-Bearing