How do you treat planterfasitis?

Arch supports: Icing, antiinflammatories, night splints, massage. If pain persists see podiatrist who may possibly give an injection, offer prp therapy , shockwave treatments etc.

Many ways: At home try res, ice, compression and elevation as well as otc anti-inflamatory such as aleve (naproxen). If this does not help, then see a podiatrist for exam and treatment.