{Reference Type}: Journal Article {Title}: Prevalence and diagnosis of polycystic ovary syndrome (PCOS) in adolescents - what's new in 2023? Systematic review. {Author}: Jakubowska-Kowal KM;Skrzynska KJ;Gawlik-Starzyk AM; {Journal}: Ginekol Pol {Volume}: 0 {Issue}: 0 {Year}: 2024 Aug 14 {Factor}: 1.216 {DOI}: 10.5603/gpl.98849 {Abstract}: Polycystic ovary syndrome (PCOS) is the most common endocrine disorder affecting approximately 5 to 18% of women of reproductive age and 3 to 11% of teenagers. The diagnostic criteria used in adult patients are not suitable for the diagnosis of adolescent patients, because some of the features may be physiological for puberty, so research is still ongoing to improve the criteria for diagnosing PCOS in teenagers. Polycystic ovary syndrome is associated with hormonal and metabolic changes and may predispose to the occurrence of many other diseases, such as obesity, metabolic syndrome, hypertension, type 2 diabetes and non-alcoholic fatty liver disease (NAFLD). Due to the high prevalence of PCOS and the various health problems it brings, it is necessary to select adolescent girls from the risk group, make an efficient diagnosis, start appropriate treatment, and lead the patient through a lifestyle change as soon as possible. Researchers' attention is increasingly focused on patients presenting with PCOS already in their teenage years. In our work, we want to look at the latest reports regarding the prevalence, pathophysiology and diagnosis of PCOS in adolescent girls.