Background: Primary dysmenorrhea is one of the most common complaints of women and is also the most common gynecological problem worldwide. These cramps are recurrent and 90% adolescent girls and about 50% women suffer from it. Purpose of the study: to determine which is more effective in alleviating primary dysmenorrhea; pulsed electromagnetic field or diclofenac drugs. Methodology: The study was a randomized, double-blinded trial, fifty adult females participated in this study, were divided randomly into two groups equal in numbers: group (A) received pulsed electromagnetic field applied on pelvic region, 3 times per week for 3 months, 20 minutes per day and group (B) received diclofenac tablets, 50 mg only with onset of menstrual pain. All participants in both groups (A and B) were assessed pre- and post-treatment through measuring progesterone level in the blood, assessment of pain using visual analogue scale and physical as well as psychological symptoms by using menstrual symptom questionnaire.