How long does it take your body to build a strong immune system after chemotherapy drugs?
Although we take care to ensure accuracy, Macmillan Cancer Support does not accept liability for the information and materials provided or referenced in Ask an Expert or for any errors or omissions in them, or for third-party information or services such as other websites we may link to. The information and materials provided or referenced in Ask an Expert are for information purposes only and are not intended to be legal, financial or medical advice or opinions. If you need more details on your rights, please contact a financial, legal or other appropriate adviser.
We recommend that you consult your doctor if you are concerned about your health. Any You should not rely on any information and materials provided or referenced in Ask an Expert including by our Experts as they are not a replacement for advice, diagnosis or treatment from your medical team, and our Experts cannot provide a second opinion to that of your medical team.
Your question can be read by others – so please don't post your contact details or any other information that could personally identify you. Please read our Terms and Conditions and Community Guidelines for more details.
How long does it take your body to build a strong immune system after chemotherapy drugs?
Dear Wantmyholiday,
Thank you for getting in touch with us, and welcome to our online community. My name is Annerose, I’m one of the Cancer Information Nurses here at the Macmillan Cancer Support line.
I understand you are seeking information about how long it takes the Immune system to fully recover from chemotherapy.
Recovery time of the immune system can be different for each person and is very individual. It could be at a minimum anything between 3 to 6 weeks.
However, studies have shown that some components of the immune system may not fully recover for several months, even up to nine months after chemotherapy.
The recovery can vary, based on the type of drug you have had, your individual health, how your reaction to the treatment has been and other variables.
It is important to monitor your blood cell count, and to discuss any concerns with your oncology team, they will be able to tell you if your immune system has fully recovered and if, for example going on a holiday would be safe.
I hope this has been helpful, but please don’t hesitate to get back in touch if you need any further information or support.
Best wishes and take care
Annerose (Cancer Information Nurse Specialist)
You can also speak with the Macmillan Support Line team of experts. Phone free on 0808 808 0000 (7 days a week, 8am-8pm) or send us an email.
Ref/ AM/LB
Whatever cancer throws your way, we’re right there with you.
We’re here to provide physical, financial and emotional support.
© Macmillan Cancer Support 2025 © Macmillan Cancer Support, registered charity in England and Wales (261017), Scotland (SC039907) and the Isle of Man (604). Also operating in Northern Ireland. A company limited by guarantee, registered in England and Wales company number 2400969. Isle of Man company number 4694F. Registered office: 3rd Floor, Bronze Building, The Forge, 105 Sumner Street, London, SE1 9HZ. VAT no: 668265007