A systematic review of the effectiveness of acupuncture in treating pelvic and back pain in pregnancy has found promising results. Two small trials on mixed pelvic/back pain and one large high-quality trial on pelvic pain met the inclusion criteria. The authors concluded that the current evidence, although limited, supports the use of acupuncture in treating the conditions.

Acupuncture for pelvic and back pain in pregnancy: a systematic review. Am J Obstet Gynecol. 2008 Mar;198(3):254-9.