The short explanation
Pregnancy is ruled out first, with a test, even when you are sure — because it is the commonest reason and the easiest to check. After that, periods stopping for three months or more is usually explained by PCOS, a thyroid problem, raised prolactin, significant weight loss or gain, heavy exercise, severe stress, a contraceptive method, or the approach of menopause.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Which explanations are likely depends heavily on your age, your weight and what else has changed. Periods stopping in your late forties usually means something different from periods stopping at twenty-three.
- Some contraceptives stop periods as an expected effect rather than a side effect — the hormonal IUD, the injection and the implant all commonly do. If you started one recently, say so early in the conversation; it can end the investigation there.
- Weight loss, intensive training and eating very little can all switch periods off, and the switch is not always proportionate to how unwell someone looks. This is worth saying out loud even if it feels unrelated.
- Periods that stop for a long time in a young woman are worth taking seriously beyond the inconvenience, because the hormonal state behind it also affects bone strength over time. That is a reason to get an explanation rather than to wait it out.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you why yours have stopped. The same absence has very different causes, and telling them apart needs a pregnancy test, an examination and blood tests.
- This cannot tell you whether you are in menopause. One blood test rarely settles that, and the answer depends on your age and the pattern over months.
- This explanation was written by AskHer's editorial team from the guidance listed under Sources. A clinician registered in India has not signed this version off yet — that is why no clinical reviewer is named at the foot of this page, and it is why nothing here is a diagnosis.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- I have done a pregnancy test and this was the result. What would you check next?
- Could my contraception be the reason?
- Which blood tests would you do, and what would each one tell us?
- If this goes on, is there anything I should be doing to protect my bone health?
- How long would you wait before investigating further?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Get help the same day
- you have missed a period and have severe one-sided abdominal pain, shoulder-tip pain or feel faint
- you have stopped having periods and are also having headaches with changes in your vision, or milky discharge from the breasts
Book an appointment soon
- you have had no period for three months and are not pregnant
- periods stopped after significant weight loss, a change in eating, or a big increase in exercise
- periods have stopped and you are under 40
- periods have stopped and you also have hot flushes, night sweats or vaginal dryness
Sources
The evidence this explanation is built on.
- Stopped or missed periods NHS
- Polycystic ovary syndrome (PCOS) NHS
- Menopause NHS
- Menopause: diagnosis and management — patient information Royal College of Obstetricians and Gynaecologists
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 AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off. That is what the “Editorially reviewed” badge means, and why it does not say “Clinically reviewed”. It was written and checked by AskHer’s editorial team against the sources listed above, and it is queued for a clinician who works in this area.
- Review status
- Editorially reviewed
- Last reviewed
- Last reviewed 28 August 2026
- 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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