Why is Estrone (E1) Low? Causes, Symptoms, and What to Do

Learn about low estrone (E1) levels, their causes, symptoms, and when to consult a doctor.

Aug 20, 2026 3 min read

Estrone (E1) is a type of estrogen, a hormone that plays a crucial role in the reproductive system. It is one of the three main estrogens in the body, alongside estradiol (E2) and estriol (E3). Estrone is considered the weaker estrogen and becomes the primary estrogen after menopause, primarily produced in fat tissue. Understanding low estrone levels is important because they can affect various bodily functions and may indicate underlying health issues.

What is Estrone (E1)?

Estrone is a naturally occurring hormone in the body, part of the estrogen family. Unlike estradiol, which is the most potent form of estrogen, estrone is less strong and is mainly produced in fat tissue, especially after menopause. This hormone is essential for regulating the menstrual cycle and maintaining reproductive health. Estrone levels can vary significantly based on factors such as sex, age, menstrual cycle phase, and menopausal status.

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Why Low Estrone Levels Matter

Low estrone levels can have several implications for health. Since estrone is involved in regulating the menstrual cycle and supporting reproductive health, its deficiency may lead to symptoms such as irregular periods, hot flashes, and mood swings. Estrone also plays a role in bone health, and low levels may contribute to bone density loss over time, increasing the risk of osteoporosis.

Causes of Low Estrone Levels

Low estrone levels can result from various factors:

  • Menopause: As women transition into menopause, estrone becomes the dominant estrogen, but overall estrogen levels decline.
  • Ovarian Function: Reduced ovarian function or failure can lead to lower estrone production.
  • Body Fat: Since estrone is produced in fat tissue, low body fat can result in lower estrone levels.
  • Hormonal Disorders: Conditions like hypogonadism, where the sex glands produce little or no hormones, can cause low estrone.

Symptoms of Low Estrone Levels

Symptoms of low estrone levels may include:

  • Irregular or absent menstrual periods
  • Hot flashes and night sweats
  • Mood changes, such as depression or anxiety
  • Decreased libido
  • Vaginal dryness
  • Fatigue

How to Interpret Estrone Levels

Estrone levels are measured in picograms per milliliter (pg/mL), and there is no single normal range due to variations with sex, age, and menopausal status. It is important to discuss your specific estrone level with your healthcare provider, who can interpret the results in the context of your overall health and symptoms.

Frequently asked questions

What are normal estrone levels?
There is no single normal range for estrone levels as they vary widely depending on factors like sex, age, and menopausal status.

How is estrone measured?
Estrone is measured through a blood test, which determines the hormone level in picograms per milliliter (pg/mL).

Can low estrone levels be treated?
Treatment depends on the underlying cause and may include lifestyle changes, hormone replacement therapy, or other medical interventions.

What lifestyle factors can affect estrone levels?
Body weight, diet, and physical activity can influence estrone levels, particularly since estrone is produced in fat tissue.

Is low estrone common after menopause?
Yes, as overall estrogen levels decline after menopause, low estrone can be more common.

When to see a doctor

If you experience symptoms such as irregular periods, hot flashes, or mood changes, it may be helpful to consult a healthcare provider. They can assess your symptoms, discuss your estrone levels, and determine if further evaluation or treatment is necessary. Remember, any decision regarding your health should be made in collaboration with your healthcare provider.

Disclaimer: This information is for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for decisions about your health.

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