Fibroids that stick out into the uterine cavity and change its shape (submucous fibroids) and ones that are within the uterine cavity (intracavity fibroids) are more likely to cause miscarriages than ones that are within the uterine wall (intramural fibroids) or bulge outside the uterine wall (subserosal fibroids).

Which type of fibroids affect pregnancy?

Studies show that in most cases, it is only submucosal fibroids which protrude into the uterus that may affect fertility. There are exceptions including large fibroids that block the openings of fallopian tubes into the uterus.

Can fibroids cause early miscarriage?

Miscarriage. Women with fibroids are much more likely to miscarry during early pregnancy than women without them (14% vs. 7.6%). And if you have multiple or very larg fibroids, your chances go up even more.