Egg freezing is considered a relatively safe, low-risk procedure. One potential risk is ovarian hyperstimulation syndrome (OHSS).
Stimulation of the ovaries is a deliberate aspect of egg freezing, as we try to obtain as many mature eggs as possible. When the ovaries are stimulated, there is a possibility of OHSS developing, which is an excessive response to the drugs used to encourage multiple follicles to form.
Most cases of OHSS are mild to moderate, occurring in up to 5% of all patients undergoing IVF treatment. This can give symptoms such as mild abdominal discomfort and nausea and usually settles with painkillers and maintaining a good fluid intake.
Very occasionally, OHSS can be more severe, causing marked swelling of the abdomen, dehydration, nausea and vomiting and difficulty in breathing. This is uncommon and may happen in up to 1% of women undergoing ovarian stimulation.
The team will manage the risk of OHSS, which might include altering the dose of stimulation medications or using a different trigger injection.