Superficial heat therapy is mainly used to relieve menstrual pain, but it does not penetrate deeper than the skin tissue. In order to penetrate deep into the deep layers and promote tissue relaxation, deep heat therapy can be effective. The treatment time for deep heat treatment is controversial, and there is no study on deep heat treatment using radio frequency for dysmenorrhea. Therefore, in this study, by applying radiofrequency waves at different times to the lower abdomen for patients with primary dysmenorrhea, the pain and changes in the autonomic nervous system were compared with thermotherapy to suggest appropriate therapeutic interventions.

Inclusion Criteria:

• Women between the ages of 18-50
• Regular menstrual cycle (24-32 days)
• Those who have had symptoms of primary dysmenorrhea for at least 1 year
• Those who have lower back pain symptoms related to menstrual pain of 5 or higher on the Visual Analysis Scale (VAS)
• The body mass index is between 20-30

Exclusion Criteria:

• pelvic inflammatory disease
• uterine fibroids, polycystic ovary syndrome. Those with gynecological findings such as endometriosis
• Those who have used an intrauterine contraceptive device
• Those who took birth control pills or nonsteroidal anti-inflammatory drugs at the time of the experiment