Egg retrieval is not a dangerous procedure for the vast majority of people who undergo it. In a study of nearly 24,000 retrievals, the overall complication rate was 0.4% per procedure, and only 0.1% required a follow-up surgical intervention. That said, it’s a real medical procedure with real risks, and understanding what those risks look like helps you know what to expect and what to watch for.
How the Procedure Works
Egg retrieval is a short, minimally invasive procedure typically done under sedation. An ultrasound probe is inserted into the vagina to locate the fluid-filled sacs (follicles) on the ovaries where eggs have developed. A thin needle is then guided through the vaginal wall into each follicle, and suction gently pulls the eggs out. The whole process usually takes under 20 minutes.
There’s no incision and no stitches. Because a needle passes through the vaginal wall, some light spotting afterward is normal and expected.
The Most Common Risk: Ovarian Hyperstimulation
The biggest risk associated with egg retrieval isn’t the retrieval itself. It’s ovarian hyperstimulation syndrome (OHSS), which results from the hormone medications used in the days before retrieval to stimulate the ovaries to produce multiple eggs. Mild OHSS, which causes nausea, bloating, and abdominal discomfort, occurs in up to 5% of IVF cycles. Moderate to severe OHSS, where fluid builds up in the abdomen and can affect breathing or kidney function, happens in roughly 1% to 5% of cycles. The mortality rate is extremely low, estimated at about one in 50,000.
People with polycystic ovary syndrome (PCOS) face a notably higher risk of OHSS. Their ovaries tend to be more responsive to stimulation medications, partly because they have much higher levels of a hormone called AMH that affects how follicles develop. In one trial of high-responding patients (a category that includes most PCOS patients), the rate of moderate to severe OHSS was 8.6% when a fresh embryo transfer followed retrieval, compared to 0% when all embryos were frozen instead.
Modern protocols have significantly reduced OHSS risk. Clinics now use different trigger medications and stimulation strategies that can bring moderate to severe OHSS rates below 2% to 3%, even in high-risk patients. A freeze-all approach, where embryos are frozen rather than transferred in the same cycle, also helps because it avoids the hormonal surge of early pregnancy that can worsen OHSS.
Bleeding and Infection
Because a needle enters the body, there’s a small chance of bleeding or infection. Significant vaginal or pelvic bleeding from vascular injury has been reported in about 0.8% of cases. Life-threatening bleeding is rare enough to be published as individual case reports. Pelvic infection after retrieval occurs in less than 1% of cases across multiple large studies. When infections do happen, they can be serious, but prophylactic antibiotics and sterile technique keep the incidence low.
What Sedation Feels Like and Its Risks
Most clinics use intravenous sedation (sometimes called “twilight” anesthesia), though some use general anesthesia. Under general anesthesia, about 12% of patients in one study experienced a brief dip in oxygen levels, and about 4% had a temporary drop in blood pressure. Neither of these events was linked to worse outcomes for the patient or the IVF cycle. The average time under anesthesia was under 17 minutes.
One concern with general anesthesia is that the sedation drug can reach the fluid surrounding the eggs. Animal studies suggest this could affect fertilization, and one human study found a slightly lower fertilization rate in retrievals done under general anesthesia compared to those done without it. However, pregnancy and live birth rates did not differ significantly between the two groups, so the clinical impact appears minimal.
Long-Term Health Concerns
A common worry is whether the hormones used during IVF increase cancer risk over time. Large follow-up studies from Israel and Norway have looked at this question. The Israeli study found generally reassuring results for most cancers, with the only signal being a small, statistically non-significant increase in ovarian cancer risk among women who completed four or more IVF cycles. The Norwegian study suggested a possible increase in breast cancer risk among women followed for the longest periods. Neither finding is definitive, and researchers at the National Cancer Institute note that continued long-term follow-up is needed to fully clarify the picture. For someone doing one or two cycles, the existing evidence does not point to a meaningful increase in cancer risk.
Normal Recovery vs. Warning Signs
Most people feel well enough to return to normal activities within a day or two, though some residual bloating and fatigue can last three to five days. Here’s what to expect versus what should prompt a call to your clinic:
Normal after retrieval:
- Mild cramping or lower abdominal soreness
- Bloating that lasts several days
- Light vaginal spotting for a day or two
- Fatigue and mild nausea from sedation
Call your doctor if you experience:
- Severe or worsening abdominal pain
- Persistent vomiting or inability to keep fluids down
- Rapid weight gain of more than 2 to 3 pounds in 24 hours (a hallmark of OHSS-related fluid retention)
- Shortness of breath or difficulty breathing
- Decreased urine output
Rapid weight gain and difficulty breathing are the two symptoms most strongly associated with OHSS progressing to a dangerous stage. If fluid accumulates around the lungs, that requires urgent medical attention. Most cases of OHSS, though uncomfortable, resolve on their own within a week or two.
Who Faces Higher Risk
Not everyone carries the same level of risk going into a retrieval cycle. You’re more likely to experience complications if you have PCOS or a history of high ovarian response, if you’re younger with a high egg count (which correlates with stronger ovarian response), or if you have a history of endometriosis or pelvic adhesions that can make the anatomy more complex for the retrieving physician. Your clinic should tailor your medication protocol based on these factors. For PCOS patients specifically, evidence supports using certain stimulation protocols and trigger strategies that have been shown to cut OHSS rates dramatically compared to older approaches.