Women with functional hypothalamic amenorrhea, or FHA – one of the most common types of secondary amenorrhoea - do not ovulate. 

Johannes Ott and Marlene Hager of the Department of Obstetrics and Gynecology, at the Medical University of Vienna, in Austria are investigating the causes of secondary amenorrhoea - also known as “paused periods” or “missed periods,” which are not due to pregnancy, and how FHA, Polycystic Ovarian Morphology (PCOM) and serum hormone balances impact diagnoses.

Read more about their research:  https://doi.org/10.1186/s12958-022-00961-y