"Our pilot study found that using manual stimulation of the needles, rather than an electrical pulse, commonly used in many Chinese studies for period pain, resulted in reduced need for pain-relieving medication and improvement in secondary symptoms such as headaches and nausea," said Dr Mike Armour, a postdoctoral research fellow at Western Sydney University's National Institute of Complementary Medicine.
"The latter was unexpected and will be explored further in future, larger trials."
During the study, the women kept a diary and underwent one of four types of manual or electro acupuncture treatments.
Twelve treatments were carried out either once or three times a week over three menstrual cycles.
The women reported significant reductions in "peak pain" during the first three days of their period and in "average pain" experienced over their entire period, with the effects sustained for 12 months.
Many also experienced improvements in PMS-related symptoms such as mood swings.
"Treatment timing appears to play a small role, with high frequency of treatment providing greater improvements in health-related quality of life," the researchers wrote.