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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.
Other less common causes of abnormal vaginal bleeding that may be more serious include: 1  Sexual abuse. 2  An object in the vagina. 3  Uterine fibroids, which are a common cause of heavy periods. 4  Structural problems, such as urethral prolapse or polyps. 5  Cancer of the cervix, uterus, ovaries, or vagina. 6  Extreme emotional stress and excessive exercise. 7  Other