The short explanation
They are one of the commonest reasons. Losing more blood each month than your body can replace gradually drains iron stores, and iron tablets alone may only keep up rather than fix it. Treating the heavy bleeding itself is often what finally stops the cycle of anaemia. Heavy periods are also worth assessing in their own right, because they can have causes such as fibroids, polyps, thyroid problems or bleeding disorders.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Signs a period is heavy include soaking through a pad or tampon every hour or two, needing to change at night, passing large clots, bleeding through clothes, or bleeding for more than a week. Many women have come to think this is normal because it always has been.
- There are several options for reducing heavy bleeding, hormonal and non-hormonal, and the right one depends on the cause and whether you want to become pregnant.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you why your periods are heavy or whether they are the only cause of your anaemia. An examination, blood tests and sometimes a scan are needed.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Are my periods heavy enough to explain my anaemia?
- What could be causing the heavy bleeding, and do I need a scan?
- What are the options for reducing the bleeding?
- Should anything else be checked as a cause of low iron?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
- Get emergency care now (call 112 or 108) for bleeding soaking a pad every hour for several hours, feeling faint or dizzy on standing, or chest pain or breathlessness.
- See a clinician within days for heavy periods with tiredness, bleeding between periods or after sex, or any bleeding after menopause.
Sources
The evidence this explanation is built on.
- Heavy periods NHS
- Iron deficiency anaemia NHS
- Anaemia World Health Organization
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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