Research is limited and the most positive reports come from musculoskeletal ailments like tendinitis and relief of muscle spasms. Here is what Mayo Clinic has to say :
https://www.mayoclinic.org/medical-professionals/physical-medicine-rehabilitation/news/the-evolving-use-of-extracorporeal-shock-wave-therapy-in-managing-musculoskeletal-and-neurological-diagnoses/mac-20527246
There are many cautions about where on the body it is used, and possible serious side effects un some cases. Even though "home use" units are being sold, proper training is required. Most insurance does not cover, but you may use HSA or FSA funds to pay for it.