This syndrome develops as a result of exogenous therapy with gonadotrophins and occurs in 1-5% of women treated in this way. The greatest risk factor for the development of ovarian hyperstimulation syndrome is the PCO syndrome.

Symptoms of OHSS are:

• Pain in the lower part of the abdomen
• Nausea / vomiting
• Increase in body weight

The expression of the symptoms varies, can be easily or severely expressed.

In severe forms of OHSS, there is:

• Strong abdominal pain
• Distended abdomen
• Ascites (free fluid in the abdomen)
• Dyspnoea (difficulty breathing)
• Oliguria (reduced urine secretion)
• Thromboembolism

The diagnosis is based on the above symptoms and the ultrasound findings of the enlarged ovary, with a multitude of follicular cysts, a free fluid in the abdomen.

Treatment depending on the severity of the symptoms may be outpatient or hospital.