Menorrhagia is the medical term for an abnormally heavy period with a normal cycle length. There is nothing intrinsically wrong with heavy periods, and it doesn’t mean something is terribly wrong, but it can mean that. It’s important to weed out the different causes so you can find the right solution.

The overarching contributing factor in most heavy menstrual bleeding seems to be oestrogen, but the reasons for this are complex and the outcome varies considerably from woman to woman, from no problems, to certain types of cancers.

If your period causes you severe pain, discomfort or impacts your life in serious ways, this is deemed abnormal and should be treated.

Diagnosis of heavy periods/menorrhagia

It is very hard to tell just how much blood is coming out, with a ‘normal’ menstrual period producing about half a cup of blood. Spreading this blood out between numerous tampons, pads or menstrual cups, it is impossible to tell how much has actually come out. The only way we have to measure is when the amount of blood changes, as a change in pattern is the key here.

You know your periods better than anyone, but a measure of a problematic heavy periods are basically a deviation from what is normal for you, since normal can mean a lot of things to a lot of people. Additionally, it is not abnormal for women to have unusual periods from time to time, including heavy ones.

Your period is heavy if:

  • Bleeding continues for more than a week or three days longer than expected
  • Occurs more than once every 21 days or arrives more than five days earlier than expected
  • Exceeds half a cup in volume or requires more than two pads or tampons more than usual

Possible causes of heavy periods

Functional menorrhagia – no known uterine problems – ‘just heavy periods’

This is used to describe a pattern of heavy bleeding that doesn’t appear to have any medical cause, but is heavily related to the areas of the brain and body that control fertility and hormones (the pituitary gland, hypothalamus and ovaries).

These three components all depend on each other heavily to function optimally, so if one is disrupted, say by stress or being overweight, it can set a hormonal trajectory that can result in heavy periods, by swinging the pendulum too far in one direction.

Elements that affect the function of the hypothalamic-pituitary-ovarian (HPO) axis are not exercising, body weight, high fat intake, high or ongoing stress, and some medications.

Low iron/iron-deficient anaemia

Having low iron can cause you to bleed heavier and longer than normal because the little spirals on the ends of endometrial cells that act as a faucet require iron to turn the tap off, and stop bleeding.

Problematically, if you are low in iron, you will bleed more because the tap is slower to turn off, and that causes further iron loss.

The below animation explains how your period occurs. Watch from the start. The presence of iron specifically allows these special spiral blood vessels to be cut off during your period like turning off a tap, stopping the bleeding.

If you are low in iron, the spiral blood vessel ‘tap’ remains turned on, and you bleed much more.

Why you get your period My Vagina Animation

Uterine fibroids – non-cancerous uterine growths

Uterine fibroids are noncancerous growths on the uterine wall (in the myometrium, which is the muscular wall), and are very common, appearing in one in five women over 30.

Symptoms include urinary disruptions as the tumours push on the bladder, and heavy bleeding. From time to time fibroids may become malignant, but it is unusual. Diagnosis is made by ultrasound.

Uterine polyps – proliferation of endometrial cells

These little dangling grape-like uterine polyps are caused by changes to the endometrial tissue.  It is similar to endometrial hyperplasia, where the cells of the endometrium proliferate beyond their usual capacities. Oestrogen is responsible for this overgrowth.

Endometriosis – bleeding outside the uterine cavity

This condition is where the endometrial lining escapes its normal home in the uterine cavity and ends up attaching itself to other organs and tissues within the abdominal cavity.

Every month these small attachments grow (as they would to grow the endometrial lining, your period), causing inflammation and pain outside of a normal menstrual period, along with changes in bleeding patterns.

Any woman menstruating/ovulating can get endometriosis, but it’s most common between the ages of 20 and 30.

Adenomyosis – bleeding into the uterine wall

Adenomyosis is caused by endometrial cells growing inside the uterine wall, instead of on the outside where they should be. Because endometrial cells are responsive to oestrogen, filling with blood, this condition can cause very heavy bleeding and a lot of pain, and occurs more often in women over 40.

Pelvic inflammatory disease (PID)

PID is an infection in the pelvic cavity and reproductive organs. PID is not necessarily infectious in nature, but a common cause is undiagnosed gonorrhoea. Symptoms of the pelvic inflammation may include heavy bleeding, but other symptoms will also likely be present, including fever, fatigue and pain.

Contraception – IUDs and tubal ligation

Intrauterine devices (IUD) can cause heavy bleeding and pain at menstruation, bleeding between periods, particularly immediately after insertion (and for several months). If the pain is severe or bleeding excessive, the IUD may have been dislodged, or an infection may have developed.

Getting your tubes tied (tubal ligation) can also cause disruption to your menstrual cycle, with one such outcome being heavy periods. This could be due to either the operation itself, or going off other forms of hormonal birth control.

Hormonal disturbances from other body systems

If you have blood clotting problems, nutrient deficiencies or disrupted hormonal levels, heavy periods can result. Your blood clotting systems are important, even during your period, and any disturbances can result in heavy bleeding. These are sometimes very serious indeed, but can range from a simple nutrient deficiency like low iron levels to leukaemia.

Von Willebrand’s disease – genetic clotting abnormality

A genetic clotting abnormality may be the cause if heavy bleeding starts with the onset of menstruation, and a girl’s first period is like a scene out of Texas Chainsaw Massacre.

Adrenal or thyroid hormone interruptions

Adrenal hormones can be disrupted from certain drugs or other disorders, and thyroid problems can also result in changes to menstruation.

Oestrogen excess or oestrogen dominance

Oestrogen excess can be brought on by a liver that is not detoxifying metabolic wastes quickly enough, including excess hormones. This leaves much more oestrogen in the blood than is ideal, which may result in oestrogen excess symptoms like heavier bleeding. If you have an under-functioning or overloaded liver you are likely to see menstrual effects.


Abnormal bleeding can be triggered by pregnancy, and may be a miscarriage.

What to do about heavy uterine bleeding

Treating abnormal uterine bleeding usually needs a combined approach with your doctor and your naturopath or other health practitioner. You need to be examined and tested to rule out serious causes, then you can start on the pathway of treatment of your choice.

It pays to get a few views from different practitioners, and not rely solely on one for your advice. Use the practitioner you feel most comfortable with and trust, and if their treatments don’t work, choose another type of practitioner. There are many ways to treat heavy periods, with regulating the root cause the most appropriate. Find the solution that works for you.

There are some excellent herbal medicines used for haemorrhaging and heavy bleeding like therapeutic dose cinnamon, for example. There are many excellent non-drug and non-surgical options that should be exhausted before an IUD, the pill or a hysterectomy are considered.

Visiting a naturopath or herbalist can be a good first step to see if the problem can be corrected at the early stage.

If you are concerned about abnormal bleeding, see your doctor to be examined thoroughly.

Jessica Lloyd - Naturopathic Practitioner, BHSc(N)

Jessica Lloyd - Naturopathic Practitioner, BHSc(N)

Jessica is a degree-qualified naturopath (BHSc) specialising in vulvovaginal health and disease, based in Melbourne, Australia.

Jessica is the owner and lead naturopath of My Vagina, and is a member of the:

  • International Society for the Study of Vulvovaginal Disease (ISSVD)
  • International Society for the Study of Women's Sexual Health (ISSWSH)
  • National Vulvodynia Association (NVA) Australia
  • New Zealand Vulvovaginal Society (ANZVS)
  • Australian Traditional Medicine Society (ATMS)
Read more about Jessica and My Vagina's origin story.