HRT side effects: what to expect
Most side effects of hormone therapy are mild, show up early and fade. Knowing what's normal, what's rare and what's fixable makes starting a lot less worrying.
The short answer: the common side effects of hormone therapy are breast tenderness, bloating, mild nausea, headaches and irregular spotting. They usually appear in the first few weeks and settle within about three months. Serious side effects such as blood clots are uncommon, and the risk depends on your age, your health and the form of hormone you use.
If a side effect doesn't settle, there's almost always something to adjust: the dose, the form of estrogen, the type of progestogen or the schedule.
Common, and usually temporary
Breast tenderness
Very common at first. Often eases within weeks, and a lower estrogen dose usually fixes it if not.
Spotting or bleeding
Irregular spotting is common in the first three to six months, especially on continuous combined therapy.
Bloating
Often linked to the progestogen. Switching type or schedule tends to help.
Headaches
Usually settle. Through-the-skin estrogen gives steadier levels, which can help if headaches continue.
Nausea
Mostly with pills. Taking them with food or switching to a patch or gel usually solves it.
Skin irritation
From patches. Rotating sites, trying another brand, or switching to a gel helps.
Less common, but important to know
These risks are real, but for healthy women who start hormone therapy before 60 or within 10 years of menopause, they're small. Your own history changes the picture, which is why we go through it carefully.
- Blood clots: a small increase with estrogen pills. Estrogen through the skin appears to carry a lower risk.
- Stroke: a small increase with oral estrogen, mainly in older women and those who start later.
- Gallbladder disease: slightly more common with estrogen pills.
- Breast cancer: combined estrogen and progestin used for several years is linked to a small increase in risk. Estrogen alone after a hysterectomy was not linked to an increase in the Women's Health Initiative.
In November 2025 the FDA began removing the boxed warnings about heart disease, breast cancer and dementia from these products. What the FDA change means
Side effects are usually a dose problem, not a dead end.
Most new patients are seen within a week, in person in Bridgewater or Nutley, or by video anywhere in New Jersey.
How we fix side effects
- Lower or adjust the estrogen dose for breast tenderness or headaches.
- Switch from a pill to a patch or gel for nausea, headaches or clot concerns. Patch vs. pill vs. cream
- Change the progestogen for bloating or low mood. Micronized progesterone is often better tolerated.
- Change the schedule from continuous to cyclic, or the reverse, for troublesome bleeding.
- Use a hormonal IUD to protect the uterus if you don't tolerate progesterone by mouth.
Because you see the same clinician at each follow-up, these adjustments happen quickly instead of starting over with someone new.
When to call
Call right away for pain and swelling in one leg, chest pain or sudden shortness of breath, a sudden severe headache, vision changes, or weakness or numbness on one side.
Call soon for bleeding that's heavy, lasts beyond about six months, or starts after a long bleed-free stretch, a new breast lump, or side effects that haven't settled after three months.
Keep reading
HRT side effect questions
What are the most common side effects of HRT?
Breast tenderness, bloating, mild nausea, headaches and irregular spotting or bleeding are the most common. They're usually worst in the first few weeks and often settle within about three months.
Is bleeding normal on HRT?
Some irregular spotting is common in the first three to six months, especially on continuous combined therapy. Bleeding that is heavy, lasts beyond about six months, or starts after a long bleed-free stretch should be checked.
Does HRT cause weight gain?
Studies have not found that hormone therapy causes weight gain. Some women notice early bloating, which usually settles. Hormone therapy may actually help limit the fat that tends to build up around the middle during menopause.
Can progesterone affect mood?
Some women feel low, irritable or bloated on certain progestogens. Switching to micronized progesterone, changing the dose or schedule, or using a hormonal IUD instead often solves it.
When should I call about HRT side effects?
Call right away for pain and swelling in one leg, chest pain or sudden shortness of breath, a sudden severe headache, vision changes or weakness on one side, or a new breast lump. Call soon for heavy or persistent bleeding, or side effects that haven't settled after three months.
- The 2022 Hormone Therapy Position Statement of The North American Menopause Society. Menopause 2022;29(7):767–794.
- U.S. Food and Drug Administration. HHS Advances Women's Health, Removes Misleading FDA Warnings on Hormone Replacement Therapy. November 10, 2025.
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