Medical Oncologist
Periods, menopause and hormones
Why have my periods stopped?
Chemotherapy can affect the ovaries, reducing the hormones that drive monthly periods, so periods often stop during treatment. This is not necessarily permanent menopause. In some women the ovaries recover after treatment and periods return; in others they do not. Age, the medicines used and the total amount all influence what happens, and your team can explain your situation.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
Why do periods stop during chemotherapy, and does it mean menopause?
Periods stop during chemotherapy because many cancer medicines affect the ovaries. The ovaries contain a store of eggs surrounded by cells that make oestrogen and progesterone, the hormones that build up and shed the womb lining each month. Chemotherapy can damage these cells and reduce the number of eggs. When hormone production falls, the womb lining no longer builds up in the usual way, and periods become irregular or stop. Doctors sometimes call this treatment-related absence of periods.
Periods stopping is not necessarily the same as permanent menopause. In some women, the ovaries are only temporarily suppressed, and hormone production and periods return in the months after treatment ends. In others, the store of eggs is reduced so much that the ovaries do not recover, and menopause has effectively begun earlier than it otherwise would. Which of these happens depends mainly on age at the time of treatment, the store of eggs beforehand, the medicines used and the total amount received. Younger women are more likely to see periods return; women nearer the natural age of menopause are less likely to. Hormone-blocking treatment after chemotherapy can also keep periods stopped for as long as it continues, which makes it harder to know what the ovaries are doing underneath. Your team can explain what is more likely for you, but no one can be completely certain in advance.
Other causes are possible
Pregnancy, significant weight loss, stress, thyroid problems and some other medicines can also stop periods, and may need checking.
Pregnancy is still possible
An egg can be released without a period first. Reliable contraception is still needed.
Symptoms give clues
Hot flushes, night sweats and vaginal dryness suggest hormone levels have fallen, but they do not prove the change is permanent.
If your periods stop, tell your team, and ask whether a pregnancy test or hormone tests are needed.What influences it
Factors that affect whether periods stop and return
- Age at treatment
- The single most important factor. Younger women have more eggs in reserve and are more likely to see periods return.
- Egg reserve before treatment
- Women who already had fewer eggs, for any reason, are more likely to have lasting changes.
- Type of medicines
- Some medicine groups, particularly alkylating medicines, affect the ovaries more than others.
- Total amount received
- Higher total amounts over the whole course increase the chance of lasting changes.
- Radiotherapy near the ovaries
- Radiotherapy to the pelvis or whole body can add to the effect on the ovaries.
- Hormone treatment afterwards
- Treatments that suppress the ovaries or block hormones can keep periods stopped while they continue.
Not sure whether this applies to you?
Ask an oncologistWhat happens next
How your team may assess stopped periods
Rule out pregnancy
A pregnancy test may be done, especially if contraception has not been reliable.
Ask about symptoms
Your team asks about hot flushes, night sweats, dryness, mood changes and sleep.
Consider hormone tests
Blood tests of hormones linked to ovarian function can give clues, usually repeated over time after treatment.
Check other causes
Thyroid tests or other checks may be arranged if the cause is unclear.
Plan follow-up
Your team may review periods, symptoms and bone health over the following months.
!
Get help the same day for any of these
A positive pregnancy test during or soon after treatment · sudden heavy bleeding after periods had stopped, especially with low platelets · severe pain in the tummy or pelvis · bleeding with dizziness, fainting or breathlessness · fever with pelvic pain or unusual discharge. Call your chemotherapy helpline or go to the nearest emergency department and say clearly that the person is on or has had chemotherapy.
Being straight with you
What this page cannot tell you
It cannot tell you whether your own periods will come back, or whether you have entered permanent menopause. That can often only be judged months after treatment, using your age, symptoms, periods and sometimes repeated hormone tests. Even then, some women see periods return later than expected.
It also cannot tell you about your fertility. Stopped periods do not always mean you cannot conceive, and returning periods do not always mean fertility is unchanged. Fertility specialists can assess this more precisely.
Hormone tests have limits
A single test during or just after treatment may not reflect later recovery. Tests are more useful when repeated.
Symptoms can be managed
Hot flushes, dryness and sleep problems can be eased. Ask your team what is safe with your cancer.
Bone and heart health
If menopause has started early, bone and heart health need attention in the long term.
Treatment decisions about hormones
Whether hormone treatment is suitable depends on your cancer. That decision belongs with your oncologist.
Emotional impact
Stopped periods can bring grief about fertility or identity. These feelings deserve support, and counselling can help.
Partners and family
Explaining what is happening can help partners understand changes in mood, sleep and desire.
Record your period history
Keeping dates of the last period and any return helps future doctors, including fertility specialists.
Young women need early discussion
For young women, conversations about fertility and hormones should begin before treatment whenever possible.
What the ovaries do each month
In a regular cycle, hormones from the brain signal the ovaries to ripen an egg. As it ripens, the ovary makes oestrogen, which thickens the womb lining. After the egg is released, progesterone prepares the lining for a possible pregnancy, and if none happens, hormone levels fall and the lining is shed as a period. Chemotherapy interrupts this cycle by damaging the cells around the eggs, so the hormone signals that lead to a period no longer happen in the usual way.
Why recovery can take many months
When the ovaries recover after treatment, it can take a long time for the remaining eggs to begin ripening again and for hormone levels to rise enough to produce a period. Some women see periods return within months, while for others it takes much longer. This is one reason doctors usually wait before concluding that menopause is lasting, and why contraception remains important in the meantime.
Talking about it at follow-up
Mention your periods at each follow-up visit, including whether they have returned, how regular they are, and any symptoms such as hot flushes or dryness. This information helps your team decide whether tests, bone health checks or symptom treatment are needed.
When hormone-blocking treatment continues
If you take treatment that suppresses the ovaries or blocks hormones after chemotherapy, periods may stay stopped until that treatment ends. Your team can explain what to expect when it finishes.
What to do next
Tell your team your periods have stopped, continue contraception, ask whether a pregnancy test or hormone tests are needed, report symptoms such as hot flushes or dryness, ask about fertility assessment if it matters to you, and keep a record of your periods.
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Commonly believed
Four beliefs about stopped periods
"Stopped periods always mean permanent menopause."
In some women the ovaries recover. Age and treatment strongly influence what happens.
"No periods means no chance of pregnancy."
Pregnancy remains possible. Keep using contraception.
"One blood test will tell me the answer."
Hormone tests are more useful when repeated over time after treatment.
"Nothing can be done about the symptoms."
Many practical and medical approaches can ease menopause-like symptoms.
Questions we are asked
Common questions about why periods stop
Why have my periods stopped during chemotherapy?
Treatment can affect the ovaries, reducing the hormones that control periods and the number of eggs.
Is it menopause?
Not necessarily. It can be temporary or lasting. Age, treatment and time after treatment help show which.
Is it permanent?
Nobody can say for certain in advance. Younger women are more likely to see periods return. Your team can explain your situation.
Can I still get pregnant?
Yes, it is possible. Continue reliable contraception.
Will hormone tests tell me?
They give clues, especially when repeated months after treatment, but cannot always predict the future.
What about hot flushes?
They suggest hormone levels have fallen. Ask your team about safe ways to ease them.
Could something else be causing it?
Pregnancy, weight loss, stress or thyroid problems can also stop periods, so tell your team.
Does it affect my bones?
If hormone levels stay low, bone health needs attention. Your team may advise on checks.
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Sources
- American Cancer Society — How Cancer and Cancer Treatment Can Affect Fertility in Women
- Macmillan Cancer Support — Early menopause and cancer treatment
- Cancer Research UK — Periods and chemotherapy
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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