Pain Relief From Dysmenorrhea Employing taVNS

"Intervention Name: Transauricular Vagus Nerve Stimulation (taVNS)~Intervention Description:~Participants will receive transauricular vagus nerve stimulation on the tragus. Frequency: 2 sessions per day (one at 10 AM and one at 6 PM). Duration: Each session will last 15 minutes. Treatment Cycle: Stimulation will be applied for 5 days each month, starting 2 days before the expected beginning of the menstrual cycle, for a total of 2 months. The participants will adjust the level of maximum stimulation they considered painless."

"Intervention Name: SHAM stimulation of the earlobe. Participants will receive SHAM stimulation on the earlobe, which does not stimulate the vagus nerve.~Frequency: 2 sessions per day (one at 10 AM and one at 6 PM). Duration: Each session will last 15 minutes. Treatment Cycle: Placebo stimulation will be applied for 5 days each month, starting 2 days before the expected beginning of the menstrual cycle, for a total of 2 months. The participants will adjust the level of maximum stimulation they considered painless."