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What Causes Uterine Fibroids to Grow

Uterine fibroids are benign growths of the muscle layer of the uterus. The chance that a fibroid is anything but benign is extremely low, so there is rarely a need for concern. But, even though they are benign, fibroids are fed by estrogen, which cycles each month. Estrogen causes these benign growths to enlarge and often multiply, resulting in many different types of symptoms. Despite being benign, uterine fibroids have a very rich blood supply and can therefore cause heavy bleeding, even to the point that somebody might become anemic or require a blood transfusion. In addition, because there may be multiple fibroids and the fibroids can be large, they can press on adjacent organs and cause what are called bulk symptoms. These include a need to urinate frequently or urgently, bloating or pain, and other symptoms. Even when they are benign, uterine fibroids can be symptomatic or require treatment. Learn more at

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