How your hormone system fits together
Hormones are chemical messengers, and the glands that make them form the endocrine system. It works as a chain of command. The hypothalamus and pituitary in the brain send signals down to the ovaries, thyroid, and adrenal glands, which release their own hormones in response — and those hormones feed back to the brain, keeping the whole loop in balance. When one part shifts, the others feel it.
That is exactly what happens in midlife. As the ovaries wind down, their falling and fluctuating output of estrogen and progesterone drives most of the changes of perimenopause and menopause, while the pituitary responds by raising FSH. Because the thyroid and adrenal (stress) systemcan produce overlapping symptoms, it's often worth looking at the whole picture rather than one gland alone. To see how the ovarian hormones move across a single month, try the menstrual cycle explorer.
Frequently asked questions
Which glands control women's hormones?
Several work together as the endocrine system. The hypothalamus and pituitary in the brain act as the control center; the thyroid in the neck sets metabolic rate; the adrenal glands above the kidneys make stress hormones and backup sex-hormone building blocks; and the ovaries produce most of the estrogen and progesterone during the reproductive years. The uterus responds to those ovarian hormones each cycle.
What does the endocrine system do?
The endocrine system is the network of glands that release hormones — chemical messengers that travel in the blood to regulate metabolism, the menstrual cycle, reproduction, stress response, bone health, mood, and more. The glands signal one another in feedback loops, so a change in one (such as the ovaries at menopause) ripples through the others.
How does menopause change these glands?
The central change is in the ovaries: their output of estrogen and progesterone falls and fluctuates, which drives most menopausal symptoms. In response, the pituitary sends out more FSH and LH. The thyroid and adrenals don't 'cause' menopause, but thyroid problems become more common with age and can mimic it, and adrenal hormones become a relatively larger source of sex-hormone precursors afterward.
Can thyroid problems feel like menopause?
Yes — the overlap is significant. An underactive or overactive thyroid can cause fatigue, weight change, mood changes, temperature sensitivity, and irregular periods, all of which also occur in perimenopause. Because the symptoms look so similar, a thyroid check is often worthwhile when symptoms are unclear. Only a clinician can sort out the cause, sometimes with a blood test.