Abstract Disclosure: F. Otsuka: None. Y. Sakurada: None. Y. Matsuda: None. T. Hasegawa: None. Y. Otsuka: None. Y. Nakano: None. K. Tokumasu: None. K. Yamamoto: None. N. Sunada: None. H. Honda: None. H. Hagiya: None. K. Ueda: None. It has been recognized that about one third of patients may suffer from prolonged illness after surviving from the acute phase of COVID-19. Various symptoms of the prolonged illness have been evaluated by many institutions including WHO. However, the mechanisms of the prolonged symptoms have yet to be elucidated. Long COVID is a complicated illness that develops after SARS-CoV-2 infection, independent of the severity of COVID-19. Long COVID is defined as symptoms that occur within 3 months after the initial infection and persist for at least 2 months. The major symptoms of long COVID include general fatigue, post-exertional malaise, headache, insomnia, dyspnea, cognitive dysfunction, low-grade fever, and muscle pain. Proposed pathophysiological mechanisms of long COVID include pathogen persistence and viral reactivation, immune dysregulation and autoimmunity, neurological abnormalities, tissue damage due to hypoperfusion and/or microclots, autonomic and endocrine dysfunctions, and dysregulation of microbiomes. In the present study, we aimed to elucidate the impact of long COVID on female reproductive health. In this retrospective study, medical records of patients who visited our long COVID clinic and clinical trends of their menstrual symptoms were evaluated. In our study, of 349 female patients who visited our clinic between Feb 2021 and Mar 2023, 223 patients with long COVID (18-50 years) were included. It was revealed that 44 females (19.7%) had menstrual symptoms associated with long COVID. The patients with menstrual symptoms were significantly older than those without menstrual symptoms (42.5 vs. 38 years). The percentage of patients with menstrual symptoms was higher during the Omicron phase (24%) than during the Preceding (13%) and Delta (12%) phases. Cycle irregularity (63.6%) was the most frequent menstrual symptom, followed by severe pain (25%), heavy bleeding (20.5%), perimenopausal symptoms (18.2%), and premenstrual syndrome (15.9%). Fatigue and depression were the most frequent complications with menstrual complaints. Scores indicating fatigue and QOL were significantly worse in long COVID patients with menstrual symptoms. Endocrine examinations showed significantly increased cortisol levels in patients with menstrual complaints although plasma adrenocorticotropin levels were not altered. Hence, long COVID has an impact on women’s reproductive and mental health. Presentation: 6/1/2024
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