HRT Side Effects in Women: What Is Common, What Is Serious and What Helps

What are the most common side effects of HRT?

Hormone replacement therapy (HRT), also called menopausal hormone therapy, usually means estrogen, plus progesterone if you still have a uterus. Most side effects are mild, show up in the first weeks, and come from the body adjusting to hormone levels it has not had for a while.

The side effects women notice most often:

• Breast tenderness or swelling
• Bloating and a feeling of fluid retention
• Spotting or irregular bleeding
• Headaches
• Nausea
• Leg cramps
• Mood changes or feeling tired, more often with progesterone
• Skin irritation where a patch or gel is applied

Many of these look like the hormone swings of perimenopause itself, so it helps to note what you felt before you started and what changed after.

HRT side effects in women, by type of hormone

Estrogen side effects

Estrogen treats hot flashes, night sweats, sleep disruption and vaginal dryness. When the dose is a little high for you, it tends to show up as:

• Sore, full or tender breasts
• Bloating or puffiness
• Nausea, especially with pills
• Headaches
• Spotting or breakthrough bleeding

Progesterone side effects

If you have a uterus, progesterone is added to protect its lining, because estrogen alone can thicken the lining and raise the risk of endometrial cancer. Progesterone's own side effects can include drowsiness or dizziness after a dose, mood changes, bloating, breast tenderness and spotting. That is why oral progesterone is usually taken at bedtime.

Read our full guide to progesterone side effects

Patch vs pill side effects

• Pills pass through the liver first. This is linked to a higher chance of blood clots than skin forms, and to more nausea for some women.
• Patches and gels go through the skin. They can cause redness, itching or a rash at the site, and a patch can loosen in heat or after swimming. Rotating the site helps.
• Combination patches deliver estrogen and a progestin, a form of progesterone, in one patch, so a woman with a uterus can cover both with one product.
• Low-dose vaginal estrogen for dryness or painful sex acts mainly in the vagina, with very little reaching the bloodstream, so body-wide side effects are uncommon.

At The Pur Health, progesterone is offered as a pill or as part of a combination patch.

How long do HRT side effects last?

For most women, early side effects ease within the first two to three months as the body adjusts. Irregular bleeding is common in the first three to six months, especially on a daily estrogen and progesterone schedule.

• Give a new dose or form about two to three months before judging it, unless a side effect is severe.
• Bleeding that is heavy, lasts beyond six months, or starts after months with no bleeding should be checked.
• Side effects that are still bothering you after a few months usually mean the dose, form or schedule should change, not that HRT cannot work for you.

Does HRT cause weight gain?

HRT is not a common cause of weight gain. Many women gain weight around menopause, especially around the belly, from changes in hormones, muscle mass, sleep and age, whether or not they take hormones. Early bloating and fluid retention can feel like weight gain and often settle. If weight is a concern, it is worth reviewing sleep, activity, protein, thyroid and blood sugar at the same visit.

What are the serious risks of HRT?

The serious risks are real but uncommon for most healthy women who start HRT before age 60 or within 10 years of their last period. The risk depends on your age, how long it has been since menopause, the type of hormone, the dose and whether it is taken as a pill or through the skin.

• Blood clots in the legs or lungs: higher with estrogen pills. Patches and gels at standard doses appear to carry a lower risk.
• Stroke: a small increase with oral estrogen, mostly in older women and at higher doses.
• Breast cancer: estrogen combined with a progestin is linked to a small increase in risk with longer use, usually after several years. Estrogen alone, for women who have had a hysterectomy, carries little or no added risk.
• Endometrial cancer: raised by estrogen alone in a woman with a uterus. Adding progesterone protects against this.
• Gallbladder disease: more common with oral estrogen.
• Heart disease and memory: starting HRT at 60 or older, or more than 10 to 20 years after menopause, carries more risk than starting earlier.

Why timing matters

For women under 60, or within 10 years of menopause, who have no reason to avoid hormones, the benefits for hot flashes, night sweats and bone loss usually outweigh the risks. Starting later shifts that balance, so the decision is made more carefully and often favors lower doses or skin forms.

What changed on the FDA labels?

In late 2025 the FDA began removing the boxed warning about heart disease, breast cancer and dementia from menopausal hormone therapy labels, and approved the first updated labels in 2026. The boxed warning about endometrial cancer stays on systemic estrogen-only products. The risks above have not disappeared. They are now described in a way that reflects age and timing.

Who should not take HRT?

Systemic estrogen is usually not prescribed if you have:

• Unexplained vaginal bleeding that has not been evaluated
• Breast cancer now or in the past, or another estrogen-sensitive cancer
• A past blood clot in the legs or lungs, or a known clotting disorder
• A past stroke or heart attack
• Active liver disease
• Pregnancy, or a known allergy to the product

Some progesterone capsules contain peanut oil, so tell your doctor about a peanut allergy. Migraine with aura, high triglycerides, gallbladder disease, smoking or high blood pressure do not always rule HRT out, but they can change which form and dose make sense.

What can you do about HRT side effects?

Most side effects can be fixed by adjusting the plan rather than stopping. Options your doctor may discuss:

1. .Lower the estrogen dose, which often eases breast tenderness, bloating and headaches.
2. .Switch from a pill to a patch or gel, which can help with nausea and is linked to a lower clot risk.
3. .Change the progesterone schedule, for example from daily to part of each month, or the reverse, depending on bleeding and mood.
4. .Take oral progesterone at bedtime so drowsiness falls during sleep.
5. .Move the patch to a new site each time, and let gels dry fully before dressing.
6. .Recheck symptoms and, where useful, blood work at follow-up before deciding on the next change.

Do not stop HRT suddenly without talking to your doctor. Stopping can bring hot flashes and sleep problems back, and a plan to taper or adjust usually works better.

When should you call a doctor right away?

• Pain, swelling, warmth or redness in one leg
• Chest pain, sudden shortness of breath or coughing up blood
• A sudden severe headache, changes in vision or speech, or weakness or numbness on one side
• A new breast lump
• Heavy bleeding or bleeding that does not stop
• Yellowing of the skin or eyes, or pain in the upper right belly

For chest pain, stroke signs or trouble breathing, call 911.

How Dr. Munib approaches HRT side effects

Dr. Munib starts with your symptoms, your personal and family history, your blood pressure and, where useful, blood work. She weighs your age and how long it has been since your last period, then explains the trade-offs of pills, patches, gels and creams so you can choose a form that fits.

If side effects come up, she may adjust the dose, the form or the progesterone schedule rather than stopping treatment. Follow-up visits recheck how you feel, and the plan changes as your body changes. Whether HRT is right for you depends on your history, and some women are better served by non-hormonal options.

Learn about hormone replacement therapy at The Pur Health

Read about hormone balancing at The Pur Health

Book a visit in Irvine

If HRT side effects are bothering you, or you want to know whether hormones are a good fit before you start, a visit can help you make a plan. The Pur Health is in-network with most PPO plans. Cash visits are $190 for new patients and $150 for returning patients. We are at 114 Pacifica, Suite 280, Irvine, CA 92618, and you can call (949) 647-5234.