What can cause the painful corns on our toes and feet?

Corns. Corns appear both on the top of a toe joint as well as between the toes. The contracture of the toes is usually biomechanical in nature. The between the toes corns are also caused by biomechanics as well as malalignment of the toes with resulting boney spurring. Xrays and an exam by a podiatrist will answer your questions and give you the help you seek. Good luck !
Friction. The toes are rubbing against each other or your shoes.....
Corns. Corns are most common with hammertoes and the body developes the corn over the bone in toe as a protective measure. See a podiatrist to trim the corns or surgery to correct the hammertoes.