Effectiveness of Additional Self-care Acupressure for Women With Menstrual Pain Compared to Usual Care Alone

Inclusion Criteria: * Women with dysmenorrhea as defined as cramping pain during every menstrual cycle * Age: 18 to 25 years * Up to now no prior history of a gynecological disease that could be a reason for dysmenorrhea * Women with menstruation in the last six weeks and a duration of menstruation cycles between 3 and 6 weeks * Women with moderate and severe pain defined as a score equal or higher than 6 on the numeric rating scale for the worst pain intensity during the last menstruation. * Written and oral informed consent * Women must be able to complete the baseline questionnaire in paper form, the electronic questionnaire via App and a electronic diary via App. * Presence of a Smartphone and agreement to do data entry through the App Exclusion Criteria: * Acupressure, acupuncture, shiatsu- or/and tuina massage at the moment or planned in the next 8 months * Known or planned pregnancy in the next 8 months.