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Aromatase excess syndrome (AES or AEXS) is a rarely diagnosed genetic and endocrine syndrome which is characterized by an overexpression of aromatase, the enzyme responsible for the biosynthesis of the estrogen sex hormones from the androgens, in turn resulting in excessive levels of circulating estrogens and, accordingly, symptoms of hyperestrogenism.
Signs of hyperestrogenism may include heightened levels of one or more of the estrogen sex hormones (usually estradiol and/or estrone), lowered levels of follicle-stimulating hormone and/or luteinizing hormone (due to suppression of the hypothalamic–pituitary–gonadal axis by estrogen), and lowered levels of androgens such as testosterone (generally only relevant to males). [1]
Side effects of HDE specific to men may include gynecomastia (breast development), feminization and demasculinization in general (e.g., reduced body hair, decreased muscle mass and strength, feminine changes in fat mass and distribution, and reduced penile and testicular size), and sexual dysfunction (e.g., reduced libido and erectile dysfunction).
This may shift the hormonal balance between androgens and estrogens toward having too much estrogen, which may increase the risk of prostate cancer. ... men report ongoing side effects even after ...
Conversely, “with too much testosterone, women often have acne, too much hair on the body, hair loss on the head, high blood pressure, elevated cholesterol, skipped cycles, or problems ...
For women, a drop in estrogen can cause weight gain, particularly in the abdomen (aka menopause belly). For men, low testosterone is linked to an increase in fat mass. Men with obesity are more ...
Gynecomastia in older men is estimated to be present in 24–65 percent of men between the ages of 50 and 80. Estimates on asymptomatic gynecomastia is about up to 70% in men aged 50 to 69 years. [26] [50] The prevalence of gynecomastia in men may have increased in recent years, but the epidemiology of the disorder is not fully understood. [40]
Other side effects of estrogens include an increased risk of blood clots, cardiovascular disease, and, when combined with most progestogens, breast cancer. [1] In men, estrogens can cause breast development, feminization, infertility, low testosterone levels, and sexual dysfunction among others.