Volunteers needed! $450 compensation available. Do you experience symptoms before your period? Investigators at the University of Southern California are seeking menstruating people who experience premenstrual symptoms, have a regular period and drink alcohol (21+) to participate in a mobile research study. Participation will include answering surveys on your smart device, wearing a ring on your finger that measures your heart rate and skin temperature, and completing urine ovulation tests. If you are interested in participating and to see if you are eligible, please complete our confidential online survey: https://pmredcap.usc.edu/surveys/?s=RXXMFEPCRP , email powerlab@usc.edu, call or text (213) 394-9320, or visit https://powerlab.usc.edu.