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Bleeding from a uterine fibroid is generally considered uterine bleeding that can make a woman niddah. It is not generally considered bleeding from trauma (dam makka or petza).
For this reason, we usually guide women with bleeding associated with uterine fibroids to consult healthcare providers about treatment options. At the same time, it is important to review the laws of stains (here and here) to minimize halachic questions.
Please don’t hesitate to follow up with us.