The exact cause of fibroids is currently unknown, however, there are some trends that can show whether you’re at risk. There’s a genetic element, and the hormones that trigger the development of your uterine lining can also promote the growth of fibroids. Studying uterine fibroids has revealed higher levels of estrogen and progesterone receptors than healthy uterine tissue. Also, fibroids are less common after menopause when your hormone levels decrease. Some environmental factors also contribute to your risk of developing fibroids, including: • Starting menstruation at an early age • Birth control • Obesity • Poor diet • Vitamin D deficiency