When it comes to understanding heavy periods, Australian women's health organisation Jean Hailes offers a clear rule of thumb: blood loss is usually about 20ml to 80ml, and losing more than 80ml is classified as a heavy period. Very few people measure their flow, though, so most of us need everyday signs instead.
This guide sticks to the practical questions: how to tell whether your period counts as heavy, what to note down, and what to do about it.
Quick answer: Your period is likely heavy if a pad or tampon can't last about three hours, you need to change overnight, you flood through protection or pass clots bigger than a 50 cent coin, or you bleed for more than 8 days. If your flow affects everyday life, see your GP.
What is considered a heavy period?
In Australia, a heavy period usually means losing more than 80ml of blood or bleeding for more than 8 days. healthdirect uses both measures and describes heavy periods as blood loss that affects your physical health, social life and emotional wellbeing. It estimates that about 1 in 4 females experience heavy periods, so you are far from alone.
Jean Hailes puts the "normal" range in context: cycles of 24 to 38 days, bleeding for about three to seven days, with the heaviest flow usually in the first day or two.
How can I tell if my period is too heavy?
Watch how long your protection lasts and how your days go. In the Jean Hailes article, a doctor explains that you should be able to go three or more hours before changing a pad or tampon, and you shouldn't need to change it overnight. Flooding through your pad or passing clots suggests your period is heavier than it should be. healthdirect adds these signs:
- changing a tampon or pad every 1 to 2 hours;
- using a towel or maternity pad in bed;
- bleeding through to your clothes;
- not being able to do your usual activities;
- feeling tired, looking pale or getting short of breath.
Is a heavy period something to worry about?
A heavy period isn't always a sign of something serious, but it is always worth discussing if it affects your life. healthdirect says that in many cases the cause is not known, and treatment depends on what is behind it. If you would like to understand the possible reasons, our article on heavy period causes explains them in more detail.
What helps with heavy periods?
Start with simple steps at home and talk to your doctor about medical options. healthdirect lists self-care such as using more than one type of protection during your period, eating well, managing stress, sleeping well, exercising and keeping a healthy weight. Medicines it mentions include tranexamic acid, anti-inflammatory drugs, a hormonal IUD, the combined pill and the progestogen-only pill, with iron supplements or an infusion if your iron is low. Surgery is considered when other treatments don't help.
When to see a GP
healthdirect says to see your doctor if you have heavy periods or your periods affect everyday life. Jean Hailes also suggests seeing a doctor if:
- bleeding is longer or heavier than usual;
- your period pain is severe;
- you bleed between periods;
- you might be pregnant;
- you have any bleeding after reaching menopause.
Get urgent care, says healthdirect, if heavy bleeding comes with dizziness or weakness, or becomes suddenly much heavier. Call triple zero (000) in an emergency, or healthdirect on 1800 022 222 for free advice.
Frequently asked questions
How long should a pad or tampon last?
According to a doctor quoted by Jean Hailes, you should be able to go three or more hours before changing a pad or tampon, and you shouldn't need to change overnight. healthdirect lists changing every 1 to 2 hours as a sign of heavy periods, so a much shorter gap is worth raising with your GP.
How many days is too long for a period?
Jean Hailes says bleeding usually lasts about three to seven days. healthdirect describes a period as heavy if you bleed for more than 8 days, even if the daily flow seems manageable. If yours regularly runs past a week, keep a note and talk to your doctor about it.
Is it normal to pass clots during a period?
Small clots can be normal, but clots larger than a 50 cent coin are listed by healthdirect as a sign of heavy periods. Jean Hailes says passing clots together with flooding suggests your period is heavier than it should be. If you notice this often, mention it to your GP. Our guide to period blood clots has more.
Can heavy periods make me feel tired?
Yes, they can. healthdirect lists tiredness, pale skin and shortness of breath among symptoms that can come with heavy periods. It recommends urgent care if you feel dizzy or weak, as these can be signs of anaemia, and says iron supplements or an infusion may be suggested if your levels are low.
Trying to work out how much you actually bleed? The Lunette period cup has measuring lines, so you can note what you collect each time you empty it, a handy record for your GP. Lunette recommends Size 2 for a heavier flow; compare menstrual cup sizes in the size guide.
This information is general in nature and isn't a substitute for advice from your doctor. If you're concerned about your periods, talk to your GP.
