17972 Ovarian Hyperstimulation Syndrome Ohss

Overview

Ovarian hyperstimulation syndrome (OHSS) is a rare but potentially serious reaction that can happen when the ovaries are stimulated with fertility medications. The ovaries become swollen and fluid leaks into the belly and chest, causing symptoms like bloating, pain, and nausea.

OHSS is not common. Mild cases occur in about 1 in 3 cycles of fertility treatment, but severe cases are rare, affecting about 1 in 100 cycles or fewer.

It affects women and people with ovaries who are undergoing fertility treatments that stimulate the ovaries to produce multiple eggs. It is more likely in those with polycystic ovary syndrome (PCOS) or a high number of developing follicles.

Symptoms

Common symptoms

• Bloating and a swollen belly
• Mild to moderate belly pain
• Nausea or vomiting
• Diarrhea
• Tenderness in the ovaries

Causes

Main causes

• The use of fertility medications called gonadotropins, which are hormone injections that stimulate the ovaries to produce many eggs
• A hormone called human chorionic gonadotropin (hCG), which is often given to trigger ovulation, can increase the risk
• In some cases, being pregnant after the treatment makes OHSS last longer or get worse

Risk factors

• Polycystic ovary syndrome (PCOS)
• Young age (under 35)
• Low body weight
• A high number of follicles seen on an ultrasound before egg retrieval
• A previous episode of OHSS
• High levels of estrogen during the treatment cycle

When to see a doctor

See a doctor urgently if:

• Call your fertility clinic or family doctor right away if you have severe belly pain, trouble breathing, or are peeing very little.

Book a routine appointment if:

• Tell your healthcare team if you notice any bloating, weight gain, or discomfort after fertility treatment, even if it feels mild.

Diagnosis

A doctor will ask about your symptoms and recent fertility treatment, examine your belly, and may use tests to check for fluid buildup and how well your kidneys and blood are working.

Tests that may be done

• An ultrasound of the ovaries and belly to look for swollen ovaries and extra fluid
• Blood tests to check blood count, kidney function, and the balance of salts and proteins
• A urine test to check for dehydration or protein loss

What to expect at your appointment

Your healthcare team will often want to see you within a day or two of your symptoms. They may measure your weight, check your tummy, and monitor your urine output. If your symptoms are mild, they may simply ask you to rest and drink fluids. If they are more severe, you may need to go to the hospital for monitoring.

Treatment

Treatment for OHSS depends on how mild or severe it is. The main goals are to relieve symptoms, keep your body's fluid and salts in balance, and prevent complications such as blood clots or kidney injury. Mild cases usually need only rest, fluids, and pain relief. Severe cases may need hospital care with close monitoring and treatment to replace fluids and proteins.

Self-care at home

• Rest and avoid strenuous activity
• Drink plenty of fluids — water, clear soups, or oral rehydration drinks — unless your doctor says otherwise
• Take over-the-counter pain relief for mild discomfort, after checking with your pharmacist or doctor
• Weigh yourself daily and note any rapid weight gain
• Avoid alcohol and caffeine

Medical treatments

In hospital, treatment may include intravenous (IV) fluids to restore blood volume, medicines to reduce the risk of blood clots, and sometimes a procedure to drain fluid from the belly (called abdominal paracentesis). If a pregnancy has occurred and OHSS is severe, the doctor will discuss the best way to manage your condition and support the pregnancy. No specific drug names are mentioned here — your specialist will choose the safest approach for your situation.

When is surgery considered?

Surgery is rarely needed for OHSS. In very rare cases, if an ovary twists (ovarian torsion) because it is enlarged, emergency surgery may be required to save the ovary.

Living with this condition

If you have OHSS, take it slowly. Listen to your body and rest. Keep track of your weight, symptoms, and how often you pass urine. Most people recover fully within one to two weeks, especially with proper care.

Lifestyle tips

• Avoid heavy lifting or vigorous exercise until your doctor says it is safe
• Take small, frequent sips of fluids rather than large amounts at once
• Wear loose, comfortable clothing
• Sleep and rest in a comfortable position to ease belly pressure

Diet and exercise

Eat light, easily digestible meals if you feel nauseous. There is no special diet for OHSS, but staying hydrated is important. Gentle walking may help you feel better, but avoid intense exercise until your belly feels less swollen.

Mental health and emotional wellbeing

Going through fertility treatment can be stressful, and developing OHSS can add to that worry. It is normal to feel anxious or low. Talk to your healthcare team about how you are feeling, and consider reaching out to a counsellor who understands fertility issues. If you are in emotional distress, remember that help is available — call your local emergency number or mental health crisis line if you ever feel unsafe.

Prevention

Not always, but fertility specialists try to reduce the risk by adjusting medication doses, using a lower dose of the trigger hormone, or freezing embryos instead of transferring them straight away. If you have had OHSS before, tell your specialist so they can plan a safer treatment cycle.

Screening programmes

During fertility treatment, your clinic will monitor you with ultrasound and blood tests. This helps them spot early signs of OHSS and adjust your treatment if needed.

Complications

If left untreated

• Severe dehydration and kidney problems
• Blood clots in the legs or lungs
• Fluid around the lungs causing breathing trouble
• Twisting of the ovary (ovarian torsion)
• In rare, very severe cases, organ failure

Long-term outlook

The good news is that with proper care, almost everyone with OHSS recovers fully. Mild cases settle within a week or two, while more serious cases may take a little longer, especially if pregnancy occurs. Your healthcare team will support you closely, and your long-term health and fertility are usually not affected.

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