What causes oestrogen levels to drop

Overview

Oestrogen is a crucial hormone primarily produced by the ovaries, playing a vital role in the female reproductive system and influencing bone health, mood, skin, and cardiovascular health. Fluctuations and drops in oestrogen levels are a natural part of a woman's life, particularly during reproductive transitions. However, various factors, both physiological and lifestyle-related, can contribute to a decrease in oestrogen.

Natural Life Stages

The most significant and natural cause of declining oestrogen levels is the aging process, specifically the transition through perimenopause and menopause. As women approach their late 40s and early 50s, the ovaries gradually begin to produce less oestrogen and progesterone. This decline is not sudden but occurs over several years. Perimenopause is the transitional phase leading up to menopause, characterized by irregular periods and fluctuating hormone levels. Menopause is officially defined as the point when a woman has not had a menstrual period for 12 consecutive months, and her ovaries have significantly reduced their oestrogen production. The average age of menopause varies globally but often falls in the early 50s.

Lifestyle Factors

Stress

Chronic stress is a significant contributor to hormonal imbalances. When the body experiences prolonged stress, the hypothalamic-pituitary-adrenal (HPA) axis becomes overactive. This axis regulates the stress response but can also interfere with the reproductive endocrine system. The body prioritizes survival functions over reproductive functions during stress, leading to a suppression of hormones like GnRH (gonadotropin-releasing hormone), which in turn reduces the production of LH (luteinizing hormone) and FSH (follicle-stimulating hormone) by the pituitary gland. These hormones are essential for stimulating the ovaries to produce oestrogen. Therefore, persistent high stress can lead to lower oestrogen levels.

Exercise

While regular physical activity is beneficial for overall health, excessive or too intense exercise, particularly when combined with insufficient calorie intake, can negatively impact oestrogen levels. This is often seen in athletes or individuals engaged in very demanding training regimens. The body perceives a lack of energy as a threat, and to conserve resources, it may downregulate non-essential functions like reproduction. This can lead to irregular or absent periods, a condition known as amenorrhea, and significantly reduced oestrogen production. This cluster of symptoms is often referred to as the 'Female Athlete Triad' or more recently, 'Relative Energy Deficiency in Sport' (RED-S).

Nutrition and Weight

Body fat is a source of aromatase, an enzyme that converts androgens (like testosterone) into oestrogens. Therefore, being underweight or experiencing significant weight loss can lead to lower oestrogen levels. Conversely, while obesity is more commonly associated with higher oestrogen levels due to increased aromatase activity in adipose tissue, rapid weight fluctuations can still disrupt hormonal balance.

Medical Conditions and Treatments

Premature Ovarian Insufficiency (POI)

POI, formerly known as premature menopause, is a condition where a woman's ovaries stop functioning normally before the age of 40. This can lead to significantly reduced oestrogen production and symptoms similar to natural menopause, including irregular periods, hot flashes, and fertility issues.

Polycystic Ovary Syndrome (PCOS)

PCOS is a common endocrine disorder characterized by hormonal imbalances, including elevated androgens and often irregular ovulation. While some women with PCOS may have higher oestrogen levels due to the accumulation of immature follicles, others can experience fluctuating or low oestrogen levels, particularly if ovulation is consistently absent.

Pituitary Gland Disorders

The pituitary gland plays a crucial role in regulating hormone production, including the release of FSH and LH, which stimulate the ovaries. Tumors, damage, or other disorders affecting the pituitary gland can impair its ability to signal the ovaries, leading to reduced oestrogen production.

Thyroid Disorders

Both hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid) can disrupt the menstrual cycle and affect oestrogen levels. The thyroid gland's hormones interact with reproductive hormones, and imbalances can lead to irregular periods and changes in oestrogen.

Medical Treatments

Certain medical treatments can intentionally or unintentionally lower oestrogen levels. Chemotherapy and radiation therapy for cancer can damage the ovaries and impair their function. Medications like GnRH agonists, used to treat conditions such as endometriosis or certain cancers, work by suppressing the production of reproductive hormones, including oestrogen.

Symptoms of Low Oestrogen

A drop in oestrogen can manifest in various ways, including:

• Irregular or absent menstrual periods
• Hot flashes and night sweats
• Vaginal dryness and discomfort during intercourse
• Mood swings, irritability, and increased risk of depression
• Sleep disturbances
• Decreased libido
• Fatigue
• Changes in skin and hair (dryness, thinning)
• Increased risk of bone loss (osteoporosis)

If you are experiencing symptoms suggestive of low oestrogen, it is important to consult with a healthcare professional for accurate diagnosis and appropriate management strategies.