The most common problem associated with fibroids is heavier menstrual bleeding. Fibroids may distort the uterine architecture and affect blood flow, causing an increase in bleeding.
Other problems associated with fibroids will usually arise if the fibroids are large. Big fibroids can press on the bowels at the back of the uterus and cause bowel habit changes, such as constipation. If they press on the bladder at the front of the uterus you may experience urinary symptoms such as needing to urinate quickly. Occasionally, fibroids become so big that you will be able to feel them by rubbing on your abdomen. Large fibroids like this can cause pain or a sensation of pressure, but they are generally painless.
Fibroids, even very big ones, rarely cause infertility. Very occasionally they may cause problems with implantation or miscarriage, but many women with fibroids go through their pregnancies without any problems.