Heavy periods: what actually counts as heavy
· 1 min read
There is a clinical definition, and there are practical signs that are easier to judge.
"Heavy" is hard to self-assess, because nobody has anything to compare against. Most people have only ever had their own periods.
The practical signs
Bleeding is generally considered heavy if you:
- Soak through a pad or tampon every hour or two for several hours in a row
- Need to change protection during the night
- Need double protection — a tampon and a pad together
- Pass clots larger than about 2.5 cm, roughly a 10p coin
- Bleed for more than seven days
- Plan your day around being near a bathroom, or avoid going out
That last one is not in the textbooks and is often the most telling.
Why it is worth acting on
Heavy bleeding is a common cause of iron-deficiency anaemia — which shows up as tiredness, breathlessness on stairs, and looking pale, and is often put down to being busy. A blood test settles it.
It also has causes worth identifying: fibroids, adenomyosis, polyps, thyroid problems, clotting disorders, and in perimenopause the hormonal changes themselves. Most are treatable.
What to bring
How many days you bleed, how often you change protection on the heaviest day, whether you pass clots and roughly what size, and whether you have felt unusually tired. That is enough for a clinician to decide whether a blood test or a scan is warranted.
Do not wait if
You are soaking through protection hourly for several hours, feel faint or short of breath, or are bleeding heavily after menopause. Those warrant prompt attention rather than the next routine appointment.