What are fibroids?

Fibroids (also know as uterine fibromyomas, leiomyomas or myomas) are non-cancerous growths or lumps of muscle tissue that form within the walls of the uterus (womb).

Fibroids can vary in size ranging from the size of a pea to the size of a rockmelon or larger.

What causes fibroids?

It is not known exactly why fibroids occur; however we do know that the female hormones, oestrogen and progesterone, play a significant role in stimulating the growth of fibroids. Fibroids occur in women of reproductive age, growing at varying rates until the onset of menopause, when they tend to decrease in size and may slowly disappear due to the loss of oestrogen and progesterone.


Fibroids occur in about 50 per cent of women. Many women will go through life not even knowing that they have fibroids as they do not commonly cause symptoms; however for some women they may affect the menstrual cycle or period, fertility, or be the cause of miscarriage or premature labour.

For these women, symptoms may include:

  • Heavy or prolonged periods
  • Iron deficiency (anaemia)
  • Frequent urination
  • Pressure sensation on the bladder, bowel or back
  • Lower back pain
  • A lump or swelling in the abdomen
  • Period pain
  • Painful sex
  • Infertility
  • Miscarriage or premature labour

Fertility is not a common problem in women with fibroids, probably affecting less than three per cent of women. In very rare instances, a fibroid may become cancerous and is called a sarcoma.


Fibroids are usually found during a gynaecological exam, ultrasound, hysteroscopy, laparoscopy, or during surgical procedures for other conditions. A hysteroscopy is an internal examination, usually under a general anaesthesia, performed using a hysteroscope (like a telescope), which is inserted along the vagina into a woman’s uterus to assess the inside cavity. A laparoscopy is an examination, performed under a general anaesthesia, through an incision in the navel (umbilicus) to look at or operate on the pelvic organs, i.e. uterus, ovaries and uterine (Fallopian) tubes.


Most fibroids will not require treatment unless they are causing problems (e.g. impairing fertility or causing period pain, heavy bleeding or pressure symptoms).

The treatment will depend on:

  • The symptoms caused by the fibroid(s) and the degree of impact on quality of life
  • The position of the fibroid(s)
  • The size of the fibroid(s)

There are a variety of treatments for fibroids depending on their size and impact.

Treatments may include:

  • Hormonal therapies – GnRH angonists are used to shrink fibroids, particularly when interfering with fertility
  • Resection of fibroid via the hysteroscope
  • Myomectomy
    • Laparoscopy
    • Laparotomy
  • Uterine artery embolisation
  • MRI directed ultrasound technique
  • Hysterectomy

The only procedure that will permanently prevent fibroids from growing or recurring is a hysterectomy (removal of the uterus).

Hormonal therapies

GnRH agonists, which cause a temporary menopause, are prescribed to shrink fibroids in the short-term, particularly when they are interfering with fertility.

Hysteroscopic fibroid resection

Hysteroscopic resection is an operation under general anaesthesia using the hysteroscope to excise (cut out) a submucosal fibroid (a fibroid that is partially or completely in the uterine cavity and partially in the wall of the uterus, usually causing heavy periods). This is a day procedure.


Myomectomy is the complete removal of a fibroid either by laparoscopy or laparotomy (an open procedure through an incision in the lower abdomen). The fibroid is removed by opening the uterus over the fibroid and removing it completely. The uterus is then stitched over where the fibroid was removed from. If performed laparoscopically, the hospital stay may be either as a day case or 1-2 day stay whereas if a laparotomy is performed, the stay in hospital may be up to four days.

Uterine artery embolisation

Uterine artery embolisation is a procedure performed by an interventional radiologist under X-ray control with either sedation or anaesthesia. A catheter is inserted into the femoral artery in the groin and threaded into the uterine artery. A substance or coils are inserted to block the artery (one or both) to reduce the blood supply to the fibroid. The size of the fibroid can shrink by 30-50 per cent.

MRI-directed ultrasound technique

This is a new technique under MRI vision in which ultrasound is used to destroy the fibroid. (In Victoria, it is performed at the Royal Women’s Hospital in Parkville.)


Hysterectomy is the removal of a woman’s uterus. Having a hysterectomy is major surgery. The decision to have a hysterectomy should only be made after the woman has been given adequate information about why, how and what the consequences may be. It is important that each woman thinks about how she feels about losing her uterus.

In a woman with fibroids, the size of the fibroids will indicate which form of hysterectomy is appropriate. An abdominal or open hysterectomy is the appropriate way in women with a very large fibroid uterus which is easily felt in the abdomen. If the uterus is smaller, a laparoscopic hysterectomy or vaginal hysterectomy may be the preferred technique.

Uterine fibroids will not recur if the whole of the uterus is removed (total hysterectomy). A total hysterectomy means that the whole of the uterus including the body of the uterus and the cervix are removed. A total hysterectomy does not routinely include the removal of the ovaries.

For more information see Hysterectomy

Further resources

Jean Hailes gynaecologist Dr Elizabeth Farrell featured on ABC radio’s The Health Report in a special report on fibroids.
To hear the full interview go to

Fact sheets

pdf Fibroids 151.50 Kb

Content updated February 4, 2011

Leave a Reply

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: