Premature Ovarian Insufficiency (POI) – Causes & Treatment
Premature Ovarian Insufficiency (POI) is a condition where the ovaries stop functioning normally before the age of 40, leading to hormone deficiency and reduced fertility.
Things worth knowing about "Premature Ovarian Insufficiency"
Premature Ovarian Insufficiency (POI) is a condition where the ovaries stop functioning normally before the age of 40, leading to hormone deficiency and reduced fertility.
What is Premature Ovarian Insufficiency?
Premature Ovarian Insufficiency (POI), also historically referred to as premature ovarian failure, is a condition in which the ovaries cease to function normally before a woman reaches the age of 40. The ovaries produce insufficient amounts of estrogen and contain a diminished number of functional follicles (egg-containing structures). This results in irregular or absent menstrual periods and can significantly reduce fertility. POI affects approximately 1% of women under 40 and must be distinguished from natural menopause, which typically occurs around age 51.
Causes
In the majority of cases, no specific cause can be identified, and the condition is referred to as idiopathic POI. Known causes include:
- Genetic factors: Chromosomal abnormalities such as Turner syndrome (monosomy X) or mutations in the FMR1 gene (associated with Fragile X syndrome) can impair ovarian function.
- Autoimmune conditions: The immune system mistakenly attacks ovarian tissue, as seen in autoimmune thyroiditis or Addison disease.
- Medical treatments: Chemotherapy and pelvic radiation therapy can permanently damage the ovarian egg reserve.
- Infections: Rarely, viral infections such as mumps can cause ovarian damage.
- Surgical procedures: Operations involving the ovaries may compromise their function.
Symptoms
The symptoms of POI closely resemble those of natural menopause and are primarily caused by estrogen deficiency:
- Irregular or absent menstrual periods (oligomenorrhea or amenorrhea)
- Hot flushes and night sweats
- Vaginal dryness and pain during intercourse
- Mood changes, irritability, and depressive symptoms
- Difficulty concentrating and sleep disturbances
- Reduced libido
- Difficulty conceiving due to reduced fertility
In the long term, estrogen deficiency increases the risk of osteoporosis (bone loss) and cardiovascular disease.
Diagnosis
The diagnosis of POI is based on clinical criteria and laboratory tests:
- Menstrual history: Absence of menstruation for at least 4 months in a woman under 40 years of age.
- Blood hormone testing: Elevated follicle-stimulating hormone (FSH) levels above 25 IU/l on two separate measurements taken at least 4 weeks apart, combined with low estradiol levels.
- Anti-Müllerian hormone (AMH): A significantly low AMH level indicates a reduced ovarian reserve.
- Ultrasound: Transvaginal ultrasound to assess the ovaries and antral follicle count.
- Genetic testing: A karyotype analysis is recommended to identify chromosomal abnormalities.
- Autoimmune screening: Testing for antibodies against the adrenal cortex and thyroid gland.
Treatment
There is currently no established cure that fully restores ovarian function. Treatment therefore focuses on correcting the hormone deficiency and preventing long-term complications.
Hormone Replacement Therapy (HRT)
Hormone replacement therapy is the primary treatment for POI. Estrogen supplementation – combined with progestogen in women with an intact uterus – relieves symptoms and significantly reduces the risk of osteoporosis and cardiovascular disease. Treatment is generally recommended until the average age of natural menopause (approximately 51 years).
Fertility and Family Planning
Women with POI who wish to conceive should be referred to a specialist in reproductive medicine. Spontaneous pregnancies can occasionally occur, as ovarian function in POI may be intermittent. Assisted reproductive options such as egg donation or the use of previously cryopreserved oocytes may be discussed.
Psychosocial Support
A diagnosis of POI can be emotionally distressing, particularly for women who wish to have children. Psychological counseling and peer support groups can provide valuable emotional assistance.
Prevention of Long-Term Complications
Regular bone density monitoring (dual-energy X-ray absorptiometry, DXA), adequate calcium and vitamin D intake, and regular physical activity are recommended to minimize long-term health risks.
References
- European Society of Human Reproduction and Embryology (ESHRE): Guideline on Premature Ovarian Insufficiency (2024). Available at: https://www.eshre.eu
- Webber L, et al. - ESHRE Guideline: management of women with premature ovarian insufficiency. Human Reproduction, 2016; 31(5):926-937.
- Nelson LM - Primary Ovarian Insufficiency. New England Journal of Medicine, 2009; 360(6):606-614.
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