Ovarian Hyperstimulation Syndrome: Symptoms, Causes, Treatment

It usually develops during or after fertility treatment. Ovaries enlarge and fluid leaks from blood vessels into the abdomen; severe disease can affect circulation and organs. Mild discomfort after egg retrieval does not establish OHSS, but worsening symptoms need assessment.

Related reading: What are the steps of IVF from stimulation to pregnancy testing?.

Symptoms include abdominal swelling, nausea and discomfort, potentially progressing to worse pain, vomiting and rapid weight gain from fluid accumulation. Reduced urine, marked thirst and breathlessness are concerning. Tell the fertility unit when stimulation medicines and egg retrieval occurred.

An excessive response to stimulation medicines and hormonal effects, particularly hCG, increase vascular permeability. Pregnancy in the treatment cycle may prolong or worsen symptoms. OHSS is not simply ovarian cysts and cannot be diagnosed from bloating alone.

Previous OHSS, polycystic ovaries, high ovarian reserve markers and a strong follicular response increase risk. Clinicians consider these factors together when planning prevention; none means that the complication is inevitable.

Assessment considers symptoms, vital signs, weight and urine output. Ultrasound may assess enlarged ovaries and abdominal fluid; blood tests check concentration, kidney function and electrolytes. Other causes of acute pain must be considered. Severity guides outpatient monitoring or admission.

Mild cases may have outpatient follow-up with specific hydration and monitoring advice. More severe cases need carefully managed fluids, monitoring and sometimes fluid drainage or thrombosis prevention. Avoid self-prescribed diuretics or medicines such as ibuprofen; excessive drinking cannot replace assessment.

Complications may include clots, electrolyte disturbance, kidney impairment and fluid affecting breathing. Enlarged ovaries are vulnerable to injury or twisting. Follow advice about avoiding intercourse and strenuous exercise while avoiding unnecessary bed rest unless specifically directed.

Clinicians reduce risk through individualized stimulation, response monitoring and, when appropriate, altered triggering, delayed embryo transfer or preventive medicines. Cabergoline is used preventively in selected circumstances, not as a general home treatment for any post-stimulation bloating.