High estrogen usually comes down to one of a few core problems: your body is making too much, it’s not breaking estrogen down efficiently, or something from outside your body is adding to the load. Sometimes it’s not even that estrogen itself is too high, but that progesterone is too low to counterbalance it. Understanding which category fits your situation is the first step toward getting levels back to normal.
Body Fat Converts Other Hormones Into Estrogen
Fat tissue is not passive storage. It actively produces estrogen by converting circulating androgens (like testosterone and its precursors) into estrogen using an enzyme called aromatase. The more fat tissue you carry, the more aromatase you produce, and the more estrogen your body generates from hormones that would otherwise serve different functions.
This matters for both women and men. In women after menopause, fat tissue actually becomes the primary source of estrogen in the body, replacing the ovaries. But at any age, carrying extra weight can meaningfully raise estrogen levels. In men, increased body fat appears to ramp up aromatase activity in part because obesity reduces available testosterone, leaving more raw material for conversion into estrogen. Inflammation from excess fat tissue can further drive this process, since inflammatory signals stimulate aromatase production.
This is one of the most common and modifiable causes of high estrogen. Even modest weight loss can reduce the amount of estrogen your fat tissue produces.
Your Liver Might Not Be Clearing Estrogen Fast Enough
Your liver is the main processing center for estrogen. After estrogen circulates through your body, the liver breaks it down through a series of chemical steps: first oxidizing it, then attaching molecules that make it water-soluble so it can be excreted through bile or urine. If any of these steps are sluggish, estrogen accumulates in your bloodstream instead of being cleared out.
Liver conditions like fatty liver disease, hepatitis, or cirrhosis can impair this process. But you don’t need a diagnosed liver disease for this to be a factor. Heavy alcohol use stresses the liver’s detoxification capacity. Certain genetic variations also affect how quickly your liver enzymes process estrogen, meaning some people are naturally slower metabolizers.
Your Gut Bacteria Can Recycle Estrogen
Even after your liver has deactivated estrogen and sent it to your digestive tract for elimination, certain gut bacteria can reverse the process. These bacteria produce an enzyme that strips the deactivation tag off estrogen molecules, reactivating them and allowing them to be reabsorbed into your bloodstream. Researchers call this collection of estrogen-recycling bacteria the “estrobolome.”
When gut bacteria are balanced, only a portion of estrogen gets recycled this way. But when the microbiome is disrupted, whether from antibiotics, poor diet, or digestive conditions, the balance can shift toward bacteria that are especially efficient at reactivating estrogen. A 2025 study in PNAS found that industrialized populations actually have a greater gut capacity for estrogen recycling compared to non-industrialized ones, suggesting that modern diets and lifestyles may be tilting this system toward higher estrogen reabsorption.
Low Progesterone Creates Relative Estrogen Excess
Your estrogen level on a blood test might technically fall within the normal range and still cause symptoms if progesterone is too low to balance it. This situation, sometimes called “estrogen dominance” or unopposed estrogen, means estrogen’s effects go unchecked. Without progesterone’s counterbalance, estrogen can drive cell overgrowth, particularly in the uterine lining, and produce the same symptoms as genuinely elevated estrogen.
This commonly happens when you’re not ovulating regularly. Progesterone is mainly produced after ovulation, so anything that disrupts ovulation (stress, perimenopause, thyroid problems, polycystic ovary syndrome) can leave you progesterone-deficient even if your ovaries are still making plenty of estrogen. The result feels identical to having too much estrogen: heavier periods, breast tenderness, mood changes, and worsening PMS.
Medications and Hormone Therapy
If you’re taking any form of estrogen, whether as menopausal hormone therapy, birth control, or a cream, patch, or vaginal ring, that directly raises your estrogen levels. Estrogen-containing medications come in pills, patches, gels, sprays, injections, and vaginal inserts, and they all add to your body’s total estrogen load. If your dose is higher than what your body needs, you can develop symptoms of excess.
Some other medications can raise estrogen indirectly by interfering with how your liver metabolizes it or by altering the hormonal feedback loop. If your high estrogen coincides with starting a new medication, that connection is worth investigating.
Environmental Chemicals That Mimic Estrogen
Dozens of synthetic chemicals can mimic estrogen’s effects in your body or interfere with how your body produces and clears its own hormones. The most well-studied include BPA (found in food packaging, can linings, and some plastics), phthalates (in cosmetics, fragrances, nail polish, and flexible plastics), and certain pesticides. Your exposure comes through food, water, skin contact, and air.
These chemicals don’t necessarily raise your measurable estrogen level on a blood test, but they activate the same receptors that estrogen does, amplifying estrogenic effects in your tissues. Plant-based compounds called phytoestrogens, found in soy foods, can have a similar though generally milder effect. Reducing exposure means choosing fragrance-free personal care products, avoiding heating food in plastic containers, and filtering drinking water when possible.
Less Common Causes Worth Knowing
Certain ovarian tumors, particularly granulosa cell tumors and thecomas, can produce estrogen independently of your body’s normal hormonal signals. These are uncommon but can cause dramatically elevated levels. Adrenal tumors can also overproduce hormones that get converted to estrogen in fat tissue. If your estrogen levels are very high without an obvious explanation, imaging studies may be warranted to rule out a hormone-producing tumor.
Symptoms in Women vs. Men
High estrogen doesn’t look the same in everyone. In women, common signs include breast swelling and tenderness, fibrocystic breasts, heavier or irregular periods, weight gain concentrated in the hips, waist and thighs, fatigue, low sex drive, worsened PMS, mood swings, and feelings of depression or anxiety. Uterine fibroids are also associated with estrogen excess.
In men, high estrogen typically shows up as enlarged breast tissue, reduced sex drive, erectile dysfunction, dry skin, and fertility problems. Men with liver disease or significant excess body fat are at the highest risk.
How Estrogen Levels Are Tested
A blood test measuring estradiol (the most active form of estrogen) is the standard check. Normal ranges in women vary dramatically depending on where you are in your menstrual cycle: roughly 20 to 350 pg/mL during the first half, peaking at 150 to 750 pg/mL around ovulation, then settling to 30 to 450 pg/mL in the second half. Because of these wide swings, a single blood draw can be misleading. Testing on a specific day of your cycle, or testing multiple times, gives a more accurate picture.
For postmenopausal women and for men, ranges are much narrower and a single test is more reliable. Your provider may also check progesterone, testosterone, and liver function to understand the full hormonal picture rather than looking at estrogen in isolation.