Medical Oncologist
Periods, menopause and hormones
Periods and chemotherapy in teenagers
Chemotherapy can make periods irregular or stop them in teenage girls, and treatment before or during puberty can sometimes delay development. Many young people have periods return and go through puberty normally after treatment, but effects on future fertility vary. Parents and teenagers deserve clear, private conversations with the team about periods, puberty and fertility options.
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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
How does chemotherapy affect periods and puberty in teenagers?
Chemotherapy can affect the ovaries in teenage girls just as it does in adult women, but young ovaries usually contain many more eggs, so they are often more resilient. During treatment, periods may become irregular, heavier, lighter or stop for a while. For girls who have not yet started their periods, treatment can sometimes delay the start of puberty or slow its progress. After treatment, many teenagers find that periods return and puberty continues normally, but this is not certain for every young person. Some medicines, higher total amounts, radiotherapy to the pelvis or brain, and high-dose treatment before a stem cell transplant are more likely to have lasting effects on the ovaries or on the hormone signals from the brain.
For parents, one of the hardest parts is thinking about future fertility for a child who may not yet be thinking about it at all. Treatment teams can often explain how likely a particular treatment is to affect fertility, and whether any fertility preservation options are possible before treatment starts. For teenagers who have gone through puberty, egg storage may sometimes be discussed; for younger girls, options are more limited and may be experimental. These conversations need to be honest, gentle and private, with information given in a way the young person can understand. Teenagers deserve to be included in decisions about their own bodies, and many want more information than parents expect. Long-term follow-up after treatment usually includes checks on growth, puberty, periods and hormones.
Periods and low counts
When platelets or white cells are low, heavy bleeding and infection are bigger risks. Pads are usually safer than tampons during treatment.
Privacy and dignity
Teenagers may feel embarrassed discussing periods, especially with relatives present. Offer private time with a nurse.
School and friends
Irregular periods can be stressful at school. Carrying supplies and having a plan helps confidence.
Ask the treatment team before chemotherapy starts how it may affect your daughter's periods, puberty and future fertility.What happens in adolescents
Effects on periods, puberty and fertility
- Periods during treatment
- May become irregular, heavier, lighter or stop for a while. Heavy bleeding with low platelets needs prompt care.
- Puberty
- May be delayed or slowed in girls who have not yet completed puberty. Specialists can monitor and support development.
- Periods after treatment
- Often return, but not in every case. The chance depends on treatment and the ovaries.
- Future fertility
- May be unaffected, reduced or, less commonly, lost. Fertility testing in later years can give more information.
- Early menopause later in life
- Some young women treated for cancer reach menopause earlier than average, even if periods return.
- Growth and bones
- Hormone changes can affect growth and bone strength, so these are checked during follow-up.
Not sure whether this applies to you?
Ask an oncologistPractical
Supporting a teenager through period changes
Ideas for parents and carers.
Prepare a period kit
Pads, spare underwear and wipes in a discreet pouch for school, hospital and travel.
Include
- Unscented pads
- Hand sanitiser
Offer private conversations
Let your teenager speak to the nurse or doctor alone if they prefer.
Explain what is normal
Reassure them that irregular periods are common during treatment, and explain which signs need reporting.
Report
- Very heavy bleeding
- Fever or pelvic pain
Talk to the school
With your teenager's agreement, ask the school to allow toilet breaks and access to a private space.
Keep a simple record
Note periods and any concerns to share at follow-up.
!
Get help the same day, or immediately, for any of these
Soaking through a pad every hour or two, or passing large clots · bleeding with dizziness, fainting or breathlessness · heavy bleeding when platelets are low · fever or shivering · severe pelvic or tummy pain · unusual discharge with fever · a teenager who is very low in mood or talks about harming themselves. Call your treatment helpline or go to the nearest emergency department and say clearly that the young person is on chemotherapy.
Being straight with you
What this page cannot tell you
It cannot tell you how your daughter's treatment will affect her periods, puberty or fertility. That depends on her age and stage of puberty, the medicines and total amount, radiotherapy and other treatments. The paediatric or adolescent oncology team can explain what is more or less likely, but certainty is not always possible.
It also cannot tell you which fertility preservation option, if any, is suitable. Options depend on age, puberty, the urgency of treatment and what is available locally. Ask the team as early as possible, because some options must happen before treatment starts.
Involving teenagers in decisions
Young people often cope better when they understand what is happening and have a say in decisions. Information can be tailored to their age.
Contraception for older teenagers
Sexually active teenagers need private, clear advice about contraception during treatment, because pregnancy must be avoided.
Emotional impact
Changes to periods, puberty and appearance can affect confidence and friendships. Counselling and peer support help.
Cultural expectations
Families may worry about marriage prospects. Accurate information about fertility helps avoid unnecessary fear.
Long-term follow-up
Regular reviews after treatment check growth, puberty, periods, hormones and bones into adulthood.
Boys have similar issues
Teenage boys can have effects on puberty and fertility too, and sperm banking may be discussed before treatment.
Records for the future
Keep a treatment summary so future doctors, including fertility specialists, know what treatment was given.
When periods do not start or return
Specialists can assess hormones and, where appropriate, offer treatment to support puberty and bone health, decided by the treating team.
Talking about fertility with a teenager
Conversations about fertility with a teenager need to match their age, maturity and wishes. Some young people want detailed information and to be fully involved in decisions; others prefer a simple explanation and to let parents and doctors lead. It helps to ask what they would like to know, use plain words, and check understanding. Many treatment teams have nurses, psychologists or youth workers who are experienced in these conversations and can support both the teenager and the family, including when there is very little time before treatment must start.
Supporting emotional wellbeing
Changes to periods, body shape, hair and energy during treatment can make teenagers feel different from friends at an age when fitting in matters a great deal. Encouraging contact with friends, even online, keeping some normal routines, and offering access to counselling or peer support groups for young people with cancer can protect confidence and mood. Parents should also look after their own wellbeing, as their calm support makes a big difference.
What to do next
Ask the team early how treatment may affect periods, puberty and fertility, discuss fertility preservation before treatment where possible, prepare a period kit, offer private conversations, talk to the school if helpful, report heavy bleeding or fever promptly, and keep up with long-term follow-up.
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Commonly believed
Four beliefs about teenagers, periods and chemotherapy
"Teenagers are too young to worry about fertility."
Fertility options often need to be discussed before treatment starts, even for young people.
"If periods return, fertility is definitely fine."
Fertility may still be reduced. Testing in later years gives more information.
"Parents should handle all these conversations."
Teenagers usually benefit from being involved and having private time with the team.
"Puberty always stops for good."
Many young people go through puberty normally after treatment, and support is available if not.
Questions we are asked
Common questions about periods in teenagers
What happens to periods in teenagers during chemotherapy?
They may become irregular, heavier, lighter or stop for a while. Heavy bleeding with low platelets needs prompt care.
Does puberty continue?
Often yes, though it may be delayed or slowed. Specialists monitor and support development.
What about future fertility?
It depends on treatment. Ask about fertility preservation before treatment and testing later.
Should my daughter use tampons?
Pads are usually safer during treatment because of infection risk.
How do I talk to my teenager about this?
Gently and honestly, at her pace, with the option of private time with a nurse.
Will her periods come back?
Many teenagers see periods return, but not all. The team can explain what is likely.
Is contraception needed for teenagers?
For sexually active teenagers, yes. Private advice should be offered.
What follow-up is needed?
Checks on growth, puberty, periods, hormones and bones into adulthood.
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Sources
- Teenage Cancer Trust — Fertility, periods and puberty
- Children's Oncology Group — Long-Term Follow-Up Guidelines
- American Cancer Society — How Cancer and Cancer Treatment Can Affect Fertility in Women
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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