The novelty of our data is that we managed to reveal similarly increased, with no statistically significant difference, in the peritoneal cavity levels of IL-6, IL-8, IL-10, VEGF and TGF-ß both in OC and OHSS patients, but found statistically significantly lower levels of the same cytokines compared to BAM and EM groups. Here, IL6 is linked to ovarian hyperstimulation syndrome.