The short answer
Egg freezing usually needs quick referral before treatment starts. Timing, hormone exposure, cost, and cancer urgency all matter.
Some chemotherapy and pelvic radiation can damage eggs, so fertility options are best discussed before treatment starts.
ACS says stimulating the ovaries takes 2 to 3 weeks before eggs can be retrieved.
Eggs, embryos, and ovarian tissue can each be frozen, and they suit different situations.
Ask your oncologist how long treatment can safely wait, and ask the fertility clinic about cost, storage fees, and insurance.
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This page is for people facing cancer treatment who want to protect their chance of having children later. It explains egg freezing and other options, timing, safety, and cost.
What gets frozen, and why timing matters
NCI says egg freezing, also called oocyte cryopreservation, removes mature eggs from the ovary and freezes them. Later, the eggs can be thawed, fertilized with sperm in a lab to form embryos, and placed in the uterus.
The reason to talk about this before cancer treatment is that treatment can harm fertility. NCI says chemotherapy can harm the ovarian follicles, which contain egg cells. It says alkylating agents carry a high risk. They can cause the ovaries to stop making mature eggs and estrogen. This can lead to primary ovarian insufficiency. Radiation to the pelvis can also affect fertility. The dose, the body part treated and your age all play a role.
Your care team will advise you on timing. They will also say whether delaying cancer treatment for a fertility procedure is safe for you.
How long it takes
ACS says stimulating the ovaries takes 2 to 3 weeks before the eggs can be retrieved. Retrieval is done through the vagina. Your clinic will tell you how many visits, blood tests and ultrasounds to expect.
Ask the clinic whether they can start stimulation right away or need to wait for your next period. Ask your oncologist how many days the plan can safely wait.
Eggs, embryos, or ovarian tissue
Three different things can be frozen. NCI describes each one.
Eggs. Mature eggs are removed and frozen.
Embryos. Eggs are fertilized with sperm in the lab, then frozen. Embryos need sperm from a partner or a donor.
Ovarian tissue. A surgeon removes egg-containing ovarian tissue, and it is frozen. Later the tissue is put back to restore hormone production and egg release. NCI says people who have had this done have conceived with or without help. NCI lists who it is for: girls who have not gone through puberty, people advised not to delay cancer treatment, and people advised not to take the hormones needed for other methods.
Ovarian transposition is a different tool. NCI says it is an operation to move the ovaries away from the area getting radiation. ACS says it is successful about half of the time, because scatter radiation can still reach the ovaries.
Breast cancer and hormones
Fertility drugs raise estrogen levels. If you have a cancer that responds to hormones, ask your oncologist and the fertility clinic how they will plan your cycle. Do not start any fertility drug without your oncologist's approval.
Gonadotropin-releasing hormone agonists, or GnRHa, cause the ovaries to shut down and stop making estradiol, a form of estrogen. NCI says they are sometimes used as hormone therapy for breast cancer in women before menopause. ACS says studies suggest this may not protect eggs as well as once thought. Do not treat it as a replacement for freezing eggs or embryos. Ask your care team about the difference.
When to get help sooner
Fertility drugs can overstimulate the ovaries. This is called ovarian hyperstimulation syndrome, or OHSS. MedlinePlus says the ovaries become very swollen, and fluid can leak into the belly and chest. MedlinePlus says OHSS affects 3% to 6% of women who go through IVF.
MedlinePlus says to weigh yourself each day. Gaining 2 pounds (1 kg) or more a day is a warning sign. Mild OHSS can cause bloating, mild belly pain and weight gain. Serious symptoms include rapid weight gain, severe pain or swelling in the belly, passing less urine, shortness of breath, nausea and vomiting, and blood clots.
- Call 911 or go to the nearest emergency department if you are short of breath, or belly pain turns severe and will not ease. Do not drive yourself.
- Call the clinic right away if you gain 2 pounds (1 kg) or more in one day. The same goes for belly swelling, passing much less urine than usual, or vomiting that stops you keeping fluids down. For emergencies, call 911 or go to the ER.
- Call the clinic right away if bloating or queasiness is not settling.
What it costs and who pays
ACS says freezing costs $10,000 or more, not counting storage fees. It says many insurance plans do not cover it. NCI says some states require insurers to cover fertility preservation, and it links to a list of those states.
Ask the fertility clinic's financial counselor for three things. Ask for the itemized quote for one cycle. Ask for the yearly storage fee. Ask for the billing codes they will submit. Then call your insurer.
Three things to settle before treatment day one
Ask your oncologist how many days the plan can safely wait. Get that answer before the fertility clinic builds a schedule around a guess.
Read what the clinic's consent form says about who controls stored eggs or embryos later. Ask what happens if a relationship ends.
Confirm who is sending records between the two clinics. The fertility team needs your diagnosis, hormone results, and treatment start date to design the cycle.
Sources
Common questions
Does this page tell me what treatment I should get?
No. It explains the topic in plain language so you can ask better questions. Your care team applies it to your diagnosis, test results, and goals.
What should I bring to the appointment?
Bring the report or letter, your medicine list, recent results, and a written list of questions. Ask what result or decision is still pending.
When should I call sooner?
During egg stimulation, call 911 or go to the nearest emergency department for shortness of breath or severe belly pain. Call the clinic right away for a weight gain of 2 pounds (1 kg) or more in a day, belly swelling, much less urine, or vomiting that stops you keeping fluids down.
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Sources last checked: 2026-07-21 what this meansLast updated: 2026-09-29Next planned review: 2028-07-21
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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