I'd need to ask you in this instance to check with the Doctor, as several infectious, renal and vascular conditions can cause groin pain.
If your back pain and groin pain began at much the same time, I'd be tempted to think your kidneys might be involved.
Please let us know what the Doctor says and we'll do our best to offer advice once we know the cause.
Best wishes
Earle
Do you have questions? Please feel free to ask.
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