DEAR MAYO CLINIC: I’ve had some foot issues, and I heard that shockwave therapy might be appropriate. How does it work? And how can it help? ANSWER: This noninvasive treatment uses sound waves to transmit energy to tissues to help with the healing process. You may hear it referred to as extracorporeal shockwave treatment. Extracorporeal means the treatment occurs outside the body, through the skin, rather than a treatment provided internally. Originally used to treat…