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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.
Vaginal bleeding is considered to be abnormal if it occurs: 1  When you are not expecting your menstrual period. 2  When your menstrual flow is lighter or heavier than what is normal for you. 3  At a time in life when it is not expected, such as before age 9, when you are pregnant, or after menopause. Uterine fibroids, which are a common cause of heavy periods. 2  For more information, see the topic Uterine Fibroids. 3  Structural problems, such as urethral prolapse or polyps. 4  Cancer of the cervix, uterus, ovaries, or vagina. 5  Extreme emotional stress and excessive exercise.