Ovarian Hyperstimulation Syndrome (OHSS)
What is Ovarian Hyperstimulation Syndrome (OHSS)?
Ovarian Hyperstimulation Syndrome is a reaction to fertility medications that stimulate egg production. When fertility drugs push your ovaries to release multiple eggs, the ovaries can swell and leak fluid into your abdomen. This condition ranges from mild discomfort to a medical emergency.
OHSS happens when your body overresponds to hormone injections used during IVF or other fertility treatments. Your ovaries become enlarged and produce too much estradiol, a key reproductive hormone. In severe cases, fluid accumulates in your belly and chest, making it hard to breathe and potentially causing dangerous blood clots.
Most cases are mild and resolve on their own within a week or two. However, severe OHSS affects about 1 to 2 percent of women undergoing fertility treatment. Monitoring your estradiol levels during treatment helps your doctor predict and prevent serious complications before they start.
Symptoms
Symptoms of OHSS typically appear within a week after egg retrieval or ovulation trigger injection. Early warning signs help you catch the condition before it becomes severe.
- Bloating and swelling in the abdomen
- Nausea, vomiting, and diarrhea
- Rapid weight gain of 5 to 10 pounds in 3 to 5 days
- Pain or tenderness in the lower belly
- Decreased urination despite drinking fluids
- Shortness of breath or difficulty breathing
- Dizziness or feeling faint
- Severe abdominal pain
- Dark-colored urine
- Chest pain or rapid heartbeat
Mild OHSS may only cause bloating and mild discomfort. Severe cases can develop quickly and require immediate medical attention to prevent life-threatening complications.
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Causes and risk factors
OHSS occurs when fertility medications overstimulate your ovaries. Injectable hormones like hCG, used to trigger ovulation before egg retrieval, are the main culprits. These medications cause your ovaries to produce many follicles at once, leading to extremely high estradiol levels. When estradiol rises above 3,000 to 4,000 pg/mL, your risk increases significantly.
Certain factors make you more vulnerable to OHSS. Women with polycystic ovary syndrome face higher risk because their ovaries already contain many follicles. Being under 30 years old, having a low body weight, or developing many follicles during treatment also increases your chances. Previous episodes of OHSS mean you are more likely to experience it again. Getting pregnant during the treatment cycle can worsen symptoms because pregnancy hormones keep estradiol levels elevated longer.
How it's diagnosed
Your fertility doctor diagnoses OHSS based on your symptoms, physical exam, and blood test results. During fertility treatment, your estradiol levels are monitored closely through regular blood draws. When estradiol rises too quickly or exceeds safe thresholds, your doctor may adjust medication doses or delay the trigger injection. Ultrasound imaging shows how many follicles are developing and whether fluid is accumulating in your abdomen.
Rite Aid offers estradiol testing at Quest Diagnostics locations nationwide. Regular monitoring during fertility treatment helps catch rising hormone levels before they cause serious problems. If you develop symptoms after egg retrieval, additional blood tests check for kidney function problems, electrolyte imbalances, and blood clotting issues that can accompany severe OHSS.
Treatment options
Treatment depends on whether your OHSS is mild, moderate, or severe. Your doctor will create a plan based on your specific symptoms and lab results.
- Drink plenty of electrolyte-rich fluids like sports drinks to stay hydrated
- Rest and avoid strenuous physical activity until symptoms resolve
- Monitor your weight daily and track urine output
- Take pain relievers like acetaminophen for discomfort, avoiding NSAIDs
- Wear compression stockings to prevent blood clots
- Hospitalization for IV fluids if you cannot keep liquids down
- Drainage of excess abdominal fluid in severe cases
- Blood thinners to prevent dangerous clots
- Freezing all embryos to avoid pregnancy until symptoms clear
Contact your fertility doctor immediately if you experience severe pain, trouble breathing, or rapid weight gain. Most mild to moderate cases improve within 1 to 2 weeks with careful monitoring and self-care at home.
Concerned about Ovarian Hyperstimulation Syndrome (OHSS)? Get tested at Rite Aid.
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Frequently asked questions
OHSS is caused by fertility medications that stimulate your ovaries to produce multiple eggs. Injectable hormones, especially the hCG trigger shot used before egg retrieval, cause your ovaries to release too much estradiol. This leads to swollen ovaries and fluid leaking into your abdomen and chest.
Normal side effects include mild bloating and cramping that improve after a day or two. OHSS causes worsening symptoms like severe abdominal swelling, rapid weight gain of more than 5 pounds in a few days, decreased urination, and trouble breathing. If your symptoms get worse instead of better, contact your doctor right away.
Yes, careful monitoring of estradiol levels helps prevent OHSS. Your doctor can adjust medication doses, delay or skip the trigger injection, or freeze embryos instead of doing a fresh transfer. Women at high risk may use different medication protocols or lower doses to reduce the chance of overstimulation.
Estradiol levels above 3,000 to 4,000 pg/mL during fertility treatment indicate high OHSS risk. Your doctor monitors your levels throughout the stimulation cycle. If estradiol rises too quickly or reaches dangerous levels, they may cancel the cycle or take steps to reduce your risk before triggering ovulation.
Mild to moderate OHSS typically resolves within 1 to 2 weeks as hormone levels naturally decline. If you become pregnant during the treatment cycle, symptoms may last longer because pregnancy hormones keep estradiol elevated. Severe cases may require hospitalization for several days until fluid buildup and other complications improve.
Mild OHSS is uncomfortable but not dangerous. Severe OHSS can cause serious complications including blood clots, kidney damage, fluid in the lungs, and ovarian twisting. About 1 to 2 percent of women undergoing fertility treatment develop severe OHSS. With proper monitoring and quick treatment, serious complications are rare.
Women with polycystic ovary syndrome have the highest risk because their ovaries contain many follicles. Other risk factors include being under 30 years old, having low body weight, developing more than 20 follicles during treatment, and previous OHSS episodes. Women who become pregnant during the treatment cycle often have worse symptoms.
Many doctors recommend freezing embryos and waiting to transfer them in a later cycle if you show signs of OHSS. Pregnancy hormones can worsen symptoms and make them last much longer. A frozen embryo transfer in a future month is just as successful and much safer when OHSS risk is high.
Focus on staying hydrated with electrolyte-rich drinks like sports drinks or coconut water. Eat small, frequent meals with adequate protein and salt to help your body retain fluids properly. Avoid alcohol and limit caffeine. If nausea makes eating difficult, try bland foods like crackers, toast, and bananas.
Avoid strenuous exercise and heavy lifting until your symptoms completely resolve. Your enlarged ovaries are at risk for twisting, which is a medical emergency. Light walking is usually fine, but ask your doctor before resuming normal activity. Most women can return to regular exercise 2 to 3 weeks after symptoms clear.