Medical Oncologist
Abiraterone side effects
Fatigue, Hot Flushes and Joint Pain — on Abiraterone
Fatigue, hot flushes and joint pain are known side effects of abiraterone. They are not a sign the drug is harming you. This page tells you which patterns are safe to manage at home and which mean you should call your oncology team today.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed August 2026
- Expected, not alarming — These are among the most common side effects of abiraterone and do not mean the treatment has gone wrong.
- They happen for a clear reason — Abiraterone reduces androgen levels throughout your body, not just in the tumour, and these symptoms follow from that.
- Most are manageable at home — Practical steps with rest, movement, clothing and fluids make a real difference for most people.
- Some patterns need a same-day call — Certain combinations of symptoms point to something that cannot wait until your next appointment.
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Fatigue, hot flushes and joint pain are expected on abiraterone. They happen because the drug reduces androgen levels throughout your body, not just in the tumour. These side effects are not a sign of harm. Most are manageable at home. A few specific patterns do need you to call your oncology team the same day.
How do you tell manageable symptoms from ones that need a call?
| Symptom | Manageable at home | Call your team today |
|---|---|---|
| Fatigue | Tired but able to carry out basic daily activities | Too weak to get out of bed or care for yourself, or worsening rapidly day on day |
| Hot flushes | Brief, uncomfortable episodes | Accompanied by fever, or drenching sweats that prevent sleep |
| Joint pain | Mild aching that eases with gentle movement | Severe pain, a visibly swollen joint, or pain worsening week on week |
| Prednisone | Taken every day exactly as prescribed | Missed one or more doses and now feeling dizzy, faint or nauseous |
| Typically starts | Often in the first few weeks of treatment, may ease over months | Any sudden worsening at any point — do not wait to report a change |
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What helps at home?
- Rest when you need to — but short gentle walks usually reduce fatigue better than bed rest.
- Keep your room cool and use a fan during hot flushes. Loose, breathable clothing helps.
- Drink water steadily through the day. Dehydration worsens both fatigue and flushing.
- For joint stiffness, gentle stretching before getting out of bed can ease the first hour of the day.
- Take your prednisone tablets every day exactly as prescribed. Never skip or halve a dose.
- Tell your oncology team everything you are taking — including herbal remedies, supplements and over-the-counter pain relief.
Why does abiraterone cause these symptoms?
Abiraterone works by blocking the enzyme your body uses to make androgens — male hormones — so that the prostate tumour is starved of the signal it needs to grow.
But androgens affect far more than the prostate. They influence energy levels, temperature regulation, and the health of joints and soft tissues. When androgen levels fall significantly, those systems notice.
Hot flushes are a direct result of that hormonal change. Fatigue and joint discomfort follow from the same reduction. These symptoms are not signs of damage — they are signs that the drug is working as intended.
Questions people commonly ask at this point
Will the fatigue improve as treatment continues?
For many people the fatigue is worst in the first few months and becomes more manageable over time as the body adjusts to lower androgen levels. It does not go away completely for most, but it often settles to a level that is easier to live with. Gentle, regular activity — even short daily walks — is one of the things that consistently helps. If fatigue is significantly limiting your daily life, tell your oncology team: there are practical adjustments that can make a real difference, and it is not something you are expected to simply push through.
Can I take a painkiller for joint pain?
Ask your oncology team before taking any painkiller regularly. Some over-the-counter anti-inflammatories can interact with other medications you are on, or affect kidney function when taken often. Your team may recommend a specific option that is safe alongside abiraterone, or suggest a physiotherapy referral if the joint pain is limiting your movement. Do not stop mentioning it because it feels minor — ongoing joint pain that is limiting daily activity is something your team can help with.
What happens if I accidentally miss a prednisone dose?
Take it as soon as you remember, unless it is nearly time for the next dose — in that case, skip the missed one and continue as normal. Do not double up. Abiraterone must always be taken with prednisone because it affects how your body produces cortisol, a hormone your body cannot function safely without. Missing doses consistently, or stopping prednisone suddenly, can cause cortisol to fall dangerously low, leading to severe dizziness, nausea and weakness. If you feel unwell after a missed dose, call your team or go to emergency care.
Should I be monitoring my blood pressure at home?
Your oncology team will advise you based on your individual situation. Abiraterone can raise blood pressure in some people because of the way it affects the adrenal system. Many teams recommend regular home monitoring, particularly in the first months of treatment. If your team has asked you to track it, record the readings and bring them to your appointments. If you have not been given specific guidance on this yet, it is a reasonable question to raise at your next visit.
Are hot flushes a sign that abiraterone is working?
Hot flushes happen because the drug is successfully reducing androgen production — they reflect the mechanism of action rather than a separate problem. But they are not a reliable measure of how well treatment is working against your specific cancer. Response is assessed through PSA trends and scans at your scheduled appointments. Try not to use symptom intensity as a proxy for effectiveness: your oncology team has more accurate tools for that, and the answer to that question belongs in your follow-up consultations.
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Common questions
Frequently asked questions
Is fatigue on abiraterone dangerous?
Ordinary fatigue from abiraterone is not dangerous on its own — it is an expected result of androgen suppression. The patterns to watch for are fatigue that is rapidly worsening over days, or fatigue combined with yellowing skin, very dark urine, or dizziness after a missed prednisone dose. Those combinations need same-day contact. Manageable treatment fatigue is best addressed through gentle regular activity, good sleep routines, and telling your oncology team so they can help adjust your schedule or workload if needed.
How long do hot flushes last on abiraterone?
There is no fixed duration — it varies from person to person. For many, flushes are more frequent early in treatment and become less disruptive over several months. They do not always disappear completely while you remain on the drug. Practical measures — staying cool, wearing loose clothing, keeping water nearby — make them more manageable day to day. If they are disturbing your sleep or significantly affecting quality of life, tell your oncology team. There are options beyond general comfort measures that your team can discuss with you.
Can I exercise if I have joint pain on abiraterone?
Gentle movement is usually encouraged rather than avoided. Complete rest tends to worsen joint stiffness from androgen deprivation rather than ease it. Short walks, gentle stretching, or low-impact activity are the kinds of movement most people find helpful. The exception is a joint that is visibly swollen, hot to the touch, or acutely painful — that needs assessment before you load it further. When in doubt, ask your oncology team whether a physiotherapy referral would help.
Why do I need to take prednisone with abiraterone?
Abiraterone blocks an enzyme involved in making androgens, but that same enzyme also plays a role in cortisol production. Cortisol is a hormone your body needs to regulate blood pressure, metabolism and the stress response. Without prednisone alongside it, abiraterone can cause cortisol to fall to a dangerous level. Prednisone replaces what your adrenal glands can no longer produce adequately. This is why missing prednisone doses is genuinely risky — and why your team monitors blood tests regularly while you are on this combination.
When should I call my oncology team about these side effects?
Call the same day if fatigue is severe enough that you cannot care for yourself, if you develop a fever alongside your symptoms, if joint pain involves a visibly swollen joint or is worsening week on week, or if you have missed prednisone doses and now feel dizzy or faint. For anything less urgent, write down what you are noticing between visits and raise it at your next appointment. Most side effect management improves once your team knows what is happening day to day — do not wait to be asked.