Table 1 Eligibility criteria

▪ Diagnosed with PHN

▪ Allergic to medical ultrasonic couplant

▪ VAS ≥ 4 points

▪ History of tumor

▪ Age ≥ 18 years

▪ Liver or kidney dysfunction

▪ Describe symptoms clearly and have ability to self-evaluate

▪ Schizophrenia or dementia

▪ Cannot be followed up on schedule

▪ Did not previously receive ESWT

▪ History of thrombosis

▪ Did not participate in other clinical trials within past 3 months

▪ Disturbance coagulation function using anticoagulants

▪ Cardiac pacemaker use

▪ Infection in the pain area

▪ Pregnant or puerperal patients

▪ Fracture or severe osteoporosis