INTRODUCTION: Pregnancy-related back pain is one of the most common musculoskeletal disorders during pregnancy. In some women, pregnancy-related back pain can be the beginning of chronic back pain for the rest of life and the cause of subsequent problems and disabilities. This study was performed with aim to systematically review the effectiveness of conservative management and physical therapy modalities in pregnancy-related low back pain and pelvic girdle pain. METHODS: A search was done in Persian language databases, including the Scientific Information Database (SID), MagIran, Iran Medex and the English-language EMBASE, including Web of Science, ClinicalTrials.gov, Scopus, Physiotherapy Evidence Database (PEDro), Allied and Complementary Medicine Database (AMED) and MEDLINE (Pubmed) without time limitation until September 2022 using the keywords included (Pregnancy OR Postnatal Care) AND (Pelvic Girdle Pain OR low back pain OR Lower Back Pain OR Low Back Ache) AND (Conservative Management OR Self-management OR Complementary Medicine OR Alternative Medicine OR Alternative Therapy OR Physical TherapyOR Kinesio TapeOR Acupuncture ORManual Therapy OR Muscle TrainingORCuppingTreatmentOR CuppingTherapyORCuppingTreatment OR Acupressure OR Massage Therapy OR Belt OR Physical Activity OR Aquatic Therapy OR Hydrotherapy OR Exercise Therapy). The Cochrane Risk of Bias tool was applied to evaluate the quality of the studies. RESULTS: Eighty-six articles entered the final results. Ergonomic training and low and moderate-intensity exercises lead to pain relief and functional improvement in pregnancy-related back or pelvic girdle pain sufferers. Local and auricular acupuncture, Kinesio taping, and modified belts separately or in combination with other methods lead to pain relief and improved performance. CONCLUSIONS: Clinicians can recommend conservative multidisciplinary management combining ergonomic training and exercise with acupuncture, Kinesio taping, and belts to manage pregnancy-related back and pelvic girdle pain. Care should be taken in choosing other interventions due to the lack of evidence.

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