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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.
Diagnosing what causes heavy periods can sometimes be difficult. However, some physical condition affecting the uterus, such as fibroids and polyps, may cause heavy menstrual bleeding. The more common reasons for heavy periods are: 1  fibroids.  polyps.