Effect of Low-frequency Electroacupuncture (EA) on Polycystic Ovary Syndrome

Inclusion Criteria:

* 1\) Unmarried women with age between 18 and 28 years and without bearing requirement within 4 months.
* 2\) Confirmed diagnosis of PCOS according to the Rotterdam criteria: Oligomenorrhea(Menstrual cycle\> 35 days, and less than 8 cycles per year), or amenorrhea (Menstrual cycle\> 90 days) and one of the following two criteria; clinical or biochemical hyperandrogenism and/or polycystic ovarian morphology.

Exclusion Criteria:

* 1\) Patients with hyperprolactinemia.
* 2\) Patients with androgens secrete increased abnormal which caused by adrenal or ovarian tumors.
* 3\) Patients with uncorrected thyroid disease\[thyroid-stimulating hormone (TSH) \<0.2 milli-International Unit /milliliter(mIU/mL) or \>5.5 mIU/mL\]except the patients with normal TSH in the past 1 year.
* 4)Suspected Cushing syndrome patients.
* 5)Patients who Received Estrogen, Progesterone or Oral contraceptives Oral contraceptives and hormone medications within the past 1 months. It takes at least one month to Eliminate these medicines, or it will influence the results
* 6\) Patients who Received other medications that have influence on Reproductive function. or metabolism within the past 2 months( such as Anti obesity medications，Anti diabetic medications， traditional Chinese medicine and so on).
* 7)Patients who took acupuncture treatment within the past 3 months.
* 8)Patient who are unwilling to give written consent to the study.