Although uterine fibroids are generally not dangerous, they can cause discomfort and may lead to complications such as a drop in red blood cells from heavy blood loss, which can cause fatigue. In rare cases, a transfusion is needed due to blood loss. Fibroids usually don’t interfere with getting pregnant. However, it is possible that fibroids, especially submucosal fibroids, could cause infertility or loss of pregnancy. Fibroids may also increase the risk of certain pregnancy complications, such as placental abruption, fetal growth restriction and preterm delivery. If your tumor is very small or you’re going through menopause, you may not have any symptoms. Fibroids may shrink during and after menopause. This is because, during menopause, women experience a drop in levels of estrogen and progesterone, hormones that stimulate fibroid growth. Symptoms of fibroids may include: • Heavy bleeding between or during your periods • Pain in the pelvis or lower back • Increased menstrual cramping • Increased urination • Pain during intercourse • Menstruation that lasts longer than usual • Pressure or fullness in your lower abdomen • Swelling or enlargement of the abdomen