A set of signs and / or symptoms that occur together with reasonable consistency. S.Hellp: haemolysis, elevated liver enzymes and low platelet count; it may occur in pregnant women in association with severe preeclampsia and eclampsia. Ovarian hyperstimulation S.: in assisted reproduction, ovarian volume increase, bloating and weight gain. Severe cases include ascites, pleural effusion, electrolyte abnormalities and hypovolemia with hypotension and reduced glomerular filtration.