Abnormal vaginal bleeding is the most common early sign of uterine cancer. This sign is more accurate after menopause, as before this period, the bleeding can have many causes. Other common signs include pain in the pelvic area, unexpected weight loss and a pelvic lump, according to WebMD.
Uterine cancer occurs mainly due to hormonal imbalance, causing the uterine lining to thicken with time. Cells divide, grow and mutate rapidly, forming a mass of tissue that causes vaginal bleeding. Women with signs of this condition should seek medical attention immediately to prevent the spread of cancerous cells to other parts of the body, reports WebMD.