Estrogen, a crucial hormone associated with female reproductive health, plays a vital role in regulating the menstrual cycle, maintaining bone density and heart health, keeping reproductive organs healthy, and influencing mood and metabolism. This essential hormone encompasses three main types: estrone (E1), estradiol (E2), and estriol (E3).

Dr. Tamara Guichard, an ob-gyn at Modern Urology, highlights these functions. Throughout a woman's life, estrogen levels naturally fluctuate, starting low at birth, surging during puberty, and eventually declining after menopause, explains Dr. Michelle Beck, an ob-gyn, menopause-certified practitioner, and medical director of obstetrics quality at Endeavor Health. These levels also change throughout the menstrual cycle and during pregnancy.

Estradiol (E2) is typically the most common form of estrogen tested due to its clinical relevance and crucial role in various bodily functions. However, estriol (E3) is tested during pregnancy, and estrone (E1) is evaluated during menopause. High estrogen is generally defined as levels exceeding the normal range, which varies significantly based on age and menstrual phase, notes Dr. Irene Woo, a reproductive endocrinologist at HRC Fertility. High estrogen often presents with discernible symptoms, prompting individuals to seek hormone testing.

While high estrogen isn't a diagnosis in itself, it usually correlates with specific medical conditions like polycystic ovary syndrome (PCOS) or lifestyle factors such as stress. Experts provide a comprehensive overview of high estrogen, covering its symptoms, causes, associated conditions, and guidelines on when to consider getting levels checked.

Common indicators associated with conditions that may involve high estrogen, as outlined by Dr. Woo and Dr. Guichard, include irregular menstrual periods, bloating, breast tenderness, mood swings, weight gain (particularly in the hips and thighs), headaches, fatigue, decreased sex drive, hair loss, and difficulty concentrating.

The causes of high estrogen are multifaceted, with genetics playing a minor role, according to Dr. Woo. More frequently, elevated estrogen levels are linked to several lifestyle factors or medical conditions:

• Pregnancy: Estrogen levels naturally rise during pregnancy, with estriol increasing to support fetal development and prepare the body for birth. Associated symptoms like breast tenderness, fatigue, nausea, mood swings, fluid retention, headaches, and changes in sex drive are common and often normal as the body adapts. Estrogen levels significantly drop back to baseline after birth, or even lower if breastfeeding.

• Medication: Certain medications, including hormone replacement therapies and some breast cancer treatments, can impact estrogen levels. Birth control pills can also affect estrogen, especially upon initiation, though dosages are monitored to prevent spikes.

• Weight: Adipose (fat) tissue can produce excess estrogen. Individuals with a higher body fat percentage may experience elevated estrogen. Conversely, higher estrogen levels can influence fat deposition, often favoring accumulation in the hips and thighs in women.

• Environmental Factors: Exposure to xenoestrogens—estrogen-like chemicals found in pesticides, plastics, and certain cosmetics—can disrupt natural hormonal balance and contribute to higher estrogen levels. Products containing parabens, phthalates, bisphenol A (BPA), and triclosan are particular culprits. To mitigate risk, Dr. Woo advises seeking safe cosmetic and household alternatives and limiting exposure to environmental estrogens.