Acupressure and premenstrual syndrome (PMS)

INTERVENTION: First intervention: Acupressure done in the third hepatic point that located at dorsal surface of the foot between the first and second toes at the point of bones junction. Intervention 1: First intervention: Acupressure done in the third hepatic point that located at dorsal surface of the foot between the first and second toes at the point of bones junction. Intervention 2: Second intervention: Acupressure done in the large intestine point that located at the dorsal surface of the hand between thumb and index finger approximately at the middle of the second metacarpus bone. Intervention 3: Third intervention: Acupressure done in the placebo point that located at dorsal surface of the foot between the third and the forth toes which is not in the line of meridian. Second intervention: Acupressure done in the large intestine point that located at the dorsal surface of the hand between thumb and index finger approximately at the middle of the second metacarpus bone. Third intervention: Acupressure done in the placebo point that located at dorsal surface of the foot between the third and the forth toes which is not in the line of meridian. CONDITION: Premenstrual syndome. ; Premenstrual tension syndrome Premenstrual tension syndrome PRIMARY OUTCOME: PMS severity. Timepoint: Start of mensuration in two cycles. Method of measurement: Premenstrual symptoms screening tool. SECONDARY OUTCOME: Quality of life. Timepoint: Start of menstruation in two cycles. Method of measurement: SF‐12 quality of life questionnaire. INCLUSION CRITERIA: INCLUSION CRITERIA: Age of 18‐45; passing at least two hours after the last meal; having moderate to severe PMS according to the score of premenstrual symptoms screening tool Exclusion criteria: Infectious or skin diseases; acute rheumatoid arthritis; lesion or dermatitis at the site of applying pressure; visual or auditory impairment; avoid taking analgesics for three hours before starting the intervention; severe psychological tension during the last six months (loss of relatives, surgery, etc); heart disease, renal disorder, diabetes, asthma, hypothyroidism or hyperthyroidism, respiratory disorder; genital disease; interval between menstruation lower than 21 or upper than 35 days; PMS in all menstrual cycle