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The fibroids can cause lower back pain and groin pain, especially around the time of period. However, if you do not have menstrual problems due to it, then no need for treatment. Usually, mild painkiller can be used for the pain at present along with simple home remedies. If the pain persists, then it would be good to get evaluated for other causes of back pain, because symptomatic fibroids would cause menstrual issues as well.