There are several different risk factors for uterine fibroids, despite the fact that we do not know why exactly they happen. For one, older women, rather than younger women are more likely to get them. African-American women in particular are more likely to get uterine fibroids than white women, especially at younger ages. And for some, it may be linked to certain levels of hormone levels that can cause fibroid uterus. People who have high processed diets or food additives are also more at risk. High blood pressure has been linked to fibroids, although it has not been shown to be a cause. And in fact, again, in pregnancy fibroids can become worse. However, women who have never been pregnant may also experience fibroids, as well as women who are obese are more at risk because of increased hormone levels.