Hormonal Imbalance
Estrogen and progesterone are the two hormones that trigger the development of the lining of the uterus during every menstrual cycle to prepare the body for pregnancy might suffer from imbalances and lead to the growth of fibroids. The changes in the balance of both estrogen and progesterone levels in the body that differ from the normal concentration can promote the growth of fibroids within the uterine wall and towards the outer muscles of the uterus. Fibroids tend to contain more progesterone and estrogen receptors than the healthy muscles cells of the uterus. However, these uterine fibroids tend to shrink in size after menopause due to the reduction in hormonal production.