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2 doctors agreed: Hard to say: Lifting the heavy object did not cause your vaginal bleeding. You may have have just seen it come out because of the abdominal pressure you exerted during the lift. The cause of the vaginsl bleeding could be start if your period, abnormal uterine bleeding, laceration , etc . The reasons are numerous.
1 Bleeding disordersâWhen the blood does not clot properly, it can cause heavy bleeding.  MedicationsâBlood thinners and aspirin can cause heavy menstrual bleeding. The copper intrauterine device (IUD) can cause heavier menstrual bleeding, especially during the first year of use.