This study is performed for comparison the effect of acupressure on third liver, sixth spleen and placebo points on primary dysmenorrhea at female dormitory. One hundred and five people will be studied in three cycles. V.A.S. (visual analog scale) tool will be used to assess the pain intensity and those who take four points or more will participate in research. Then the subjects will be divided into three groups randomly: pressure on SP.6, liv.3 and placebo point. In the first menstrual cycle, participants will determine pain intensity at the onset of bleeding and half, 1, 2 and 3 hours later and we will teach them method of applying pressure. The pressure will be applied on both feet alternately as 2 minutes on the pressure point rotating clockwise and 2 minutes rest. Pressure will be applied two times on each leg and a total of four times (a total of 16 minutes). Each time pressure will be stopped with feeling De Chi (i.e. Feeling of tingling, heat, cold, creep) and will be applied on another foot after 2 minutes. In the second and third menstrual cycles, the research unit will apply the pressure herself. Pain intensity will record 0, 0.5, 1, 2, 3 hours after onset of bleeding using V.A.S. scale.