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Why do luteinizing hormone levels increase after menopause?

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Luteinizing hormone (LH) levels increase after menopause primarily due to the depletion of ovarian follicles and the resulting significant decline in estrogen production.12

During a woman's reproductive years, the pituitary gland and the ovaries operate through a system of feedback mechanisms. Under normal conditions, estrogen exerts a regulatory influence on the pituitary gland. As menopause approaches, the number of ovarian follicles decreases, leading to an 80 percent or greater reduction in estrogen secretion.12

Because estrogen levels are no longer sufficient to provide the usual feedback inhibition to the pituitary gland, the secretion of luteinizing hormone and follicle-stimulating hormone increases significantly. This rise in hormone levels serves as clinical evidence that the pituitary gland remains functional and is attempting to stimulate the ovaries, even though ovarian function has markedly declined.12