Women take hormones for a wide range of reasons, from managing menopause symptoms and preventing bone loss to treating conditions like endometriosis, PCOS, and thyroid disorders. Some take hormonal birth control for period pain or acne rather than contraception. Others use hormones during fertility treatments or as part of gender-affirming care. The specific hormones and goals vary enormously, but the common thread is correcting an imbalance or shifting the body’s hormonal environment to relieve symptoms and protect long-term health.
Managing Menopause Symptoms
This is one of the most common reasons women take hormones. As estrogen levels drop during perimenopause and menopause, many women experience hot flashes, night sweats, mood changes, and sleep disruption. Hot flashes typically strike the face and upper body before spreading, and they can range from mildly annoying to severe enough to interfere with work and daily life. Menopausal hormone therapy is the single most effective treatment for these vasomotor symptoms.
The drop in estrogen also causes changes in the urinary tract and vaginal tissue, now collectively called genitourinary syndrome of menopause. Symptoms include vaginal dryness, burning, pain during sex from reduced lubrication, and urinary problems like recurrent UTIs and urgency. Both systemic hormone therapy (pills or patches) and low-dose vaginal estrogen improve these symptoms by restoring blood flow, lubrication, and tissue health.
Hot flashes and night sweats often improve within a few weeks of starting therapy. Mood changes and vaginal dryness can take a few months to fully respond. Current guidelines consider hormone therapy appropriate for women who start within 10 years of their final menstrual period.
Preventing Osteoporosis
Estrogen plays a direct role in maintaining bone density. When levels fall at menopause, bone loss accelerates, raising the risk of fractures. Hormone therapy doesn’t just slow this process; it reduces the risk of vertebral fractures by about 40%, hip fractures by 30%, and all osteoporotic fractures by 20 to 30% compared to calcium and vitamin D alone. It also protects the internal microarchitecture of bone, not just its overall density. For women under 60 or within 10 years of menopause who are at risk for osteoporosis, hormone therapy is considered an appropriate preventive strategy.
Hormonal Birth Control Beyond Contraception
Many women take hormonal contraceptives for reasons that have nothing to do with preventing pregnancy. Combined pills containing estrogen and a progestin are a first-line treatment for painful periods (dysmenorrhea), which can be severe enough to force women to miss school or work. These pills reduce menstrual flow and suppress the hormonal fluctuations that trigger cramping.
Hormonal contraceptives also treat acne, excess facial and body hair, and oily skin. They work by suppressing the ovaries’ production of androgens (the hormones responsible for these effects) and by increasing a protein in the blood that binds up free androgens, making them inactive. Certain pills contain progestins with additional anti-androgenic properties, making them especially effective for skin and hair concerns.
Premenstrual syndrome and its more severe form, premenstrual dysphoric disorder, also respond to hormonal contraceptives. By stabilizing or flattening the hormonal shifts across the menstrual cycle, these medications reduce the mood swings, irritability, and physical symptoms that peak in the days before a period.
Treating PCOS
Polycystic ovary syndrome is one of the most common hormonal disorders in women of reproductive age, characterized by excess androgen production, irregular periods, and often insulin resistance. Combined oral contraceptives are a cornerstone of treatment because they address several problems at once: they regulate the menstrual cycle, reduce acne and unwanted hair growth, and improve metabolic markers like cholesterol levels.
For women with more pronounced hirsutism or acne, additional medications that block androgen receptors (such as spironolactone) are sometimes paired with the pill. Third-generation pills containing anti-androgenic compounds have shown benefits for both the visible symptoms and the underlying metabolic profile of PCOS, improving lipid levels and other markers linked to long-term cardiovascular risk.
Controlling Endometriosis Pain
Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus, causing chronic pain, heavy periods, and sometimes fertility problems. This tissue responds to estrogen the same way the uterine lining does, growing and bleeding with each cycle. The goal of hormonal treatment is to lower estrogen levels and reduce the growth and activity of these misplaced patches of tissue.
Several hormonal approaches are used. Combined oral contraceptives suppress ovulation and reduce menstrual flow. Progestins create a low-estrogen state that shrinks endometrial tissue. For more severe cases, medications that act on the brain’s hormonal signaling system can temporarily shut down ovarian function, creating a near-menopausal hormonal environment that starves the tissue of estrogen. After surgical removal of endometrial implants, hormonal therapy is commonly prescribed to prevent regrowth.
Replacing Thyroid Hormones
Thyroid hormone replacement is one of the most widely prescribed medications for women, though it’s often not thought of in the same category as “hormones.” Hypothyroidism, where the thyroid gland doesn’t produce enough hormone, is far more common in women than men. The synthetic thyroid hormone levothyroxine replaces what the body can’t make on its own, restoring normal metabolism, energy levels, and mood. Doses are adjusted over time based on blood tests and how a person feels, and most women take it long-term.
Fertility Treatments
Women undergoing IVF or other assisted reproduction take hormones to stimulate the ovaries into producing multiple eggs in a single cycle rather than the usual one. The process, called controlled ovarian hyperstimulation, uses injectable forms of follicle-stimulating hormone and luteinizing hormone to drive egg development. Additional hormones prevent the body from releasing those eggs too early, so they can be retrieved at the right moment.
Some protocols use medications that block estrogen receptors, tricking the brain into ramping up its own hormone production to stimulate the ovaries. Others use synthetic versions of the brain’s natural signaling hormones to take precise control of the timing. The specific combination depends on how a woman’s ovaries are expected to respond, and protocols have become increasingly tailored over the past several decades, improving success rates significantly.
Gender-Affirming Hormone Therapy
Transgender women and some nonbinary people take estrogen and anti-androgen medications to develop female secondary sex characteristics. The physical changes include breast development, redistribution of body fat to a more typically female pattern, reduced muscle mass, softer skin, decreased body hair, and slowing or reversal of scalp hair loss. Sexual changes include reduced erectile function and decreased testicular size.
These physical shifts happen gradually over months to years, and the therapy also brings changes in emotional processing and social experience. For many transgender women, feminizing hormone therapy is a medically necessary treatment that significantly improves quality of life and psychological well-being.