Key content: Premature ovarian insufficiency (POI) is a clinical syndrome involving ovarian follicle depletion and defined by loss of ovarian function before 40 years of age. The diagnostic workup in women with suspected POI is in two steps: confirming the diagnosis and establishing its cause; it is important to understand the rationale for performing each diagnostic test, how to interpret results and appropriate multidisciplinary team involvement. Treatment options include various regimens and preparations of hormone replacement therapy (HRT), monitoring and surveillance, induction of puberty in those with very early POI, complimentary treatment and fertility treatment. Management of POI requires a comprehensive and personalised strategy that addresses not only the physical symptoms and disease risks, but also the psychosocial and reproductive health aspects, and it is important that women receive adequate counselling. Learning objectives: To raise awareness of early diagnosis of POI. To be able to discuss the implications of POI for the health of women affected and their families, as well as for different hormonal and non‐hormonal treatment options. To understand various fertility treatment options for POI. Ethical issues: It is important to consider the reproductive and diagnostic implications for women with chromosomal or genetic problems (e.g. Turner syndrome, Fragile X mutation carriers) and for their family members. A diagnosis of POI may have differing implications based on social and cultural factors, and healthcare providers should consider a patient's values, beliefs, cultural background and preferences.