Transcutaneous Tibial Nerve Stimulation on Women With Primary Dysmenorrhea

This study is testing a nerve stimulation treatment called transcutaneous tibial nerve stimulation (TTNS) — which delivers gentle electrical pulses through the skin near the ankle — to help reduce period pain (primary dysmenorrhea) in young women. This is a non-drug, non-invasive approach to managing menstrual cramps. **You may be eligible if:** - You are between 20 and 25 years old - You have a BMI of 30 or below - A gynecologist has diagnosed you with primary dysmenorrhea (period pain with no underlying condition) - You have regular menstrual cycles - You experience pain in the lower abdomen, lower back, or upper thighs during at least half of your periods or in the last 3 cycles **You may NOT be eligible if:** - You have a diagnosed gynecological condition (e.g., endometriosis, fibroids) - You use oral contraceptives or have an intrauterine device (IUD) - You have a bleeding disorder, cancer, severe mental illness, or nerve problems in your legs - You smoke or take oral sedatives - You have had surgery or given birth in the last 6 months - You are pregnant Talk to your doctor to see if this trial is right for you.