What are the most common side effects of HRT?
The three most common side effects of hormone replacement therapy are breast tenderness, bloating with fluid retention, and headaches. These often relate to hormone levels being higher than your body needs, an imbalance between estrogen and progesterone, or how your body metabolizes estrogen. Most are manageable, frequently by adjusting your HRT with your prescriber. If you experience side effects, the first step is to talk with the provider who prescribed your therapy.
Hormone Replacement Therapy can have side effects. Today we will talk about the three most common side effects and how to fix each.
The number one most common HRT symptom is breast tenderness.
The reason for breast tenderness is twofold.
When you take HRT, typically estrogen and progesterone, you're stimulating your breast, which is natural - that's what estrogen and progesterone do. But if you're taking too much or if you're not metabolizing your estrogen appropriately - making more of the inflammatory types of estrogen rather than the noninflammatory types - you're going to have more breast tenderness.
Taking DIM, an IC3 indole found in cruciferous vegetables, can help your estrogen metabolism favor noninflammatory 2OH estrone rather than 16OH estrone. I recommend 100 to 200 milligrams of DIM per day and up to 400 milligrams to treat breast tenderness.
Sometimes DIM is not enough and you also need to add some flax ligands and EPA to improve your estrogen metabolism. In the worst-case scenario, if your gut is out of balance, and your microflora is producing too much betaglucuronodase, which frees the steroid hormones that you should be defecating out, you will need to add some Cal-d-glucarate to your supplement regimen.
Too much progesterone can also cause breast tenderness.
The number two most common side effect of hormone replacement therapy is bloating and fluid retention.
When you have too much estrogen on board compared to progesterone, you will retain water in your tissues that will make you feel bloated.
Your fingers look like sausages Your feet and ankles are swollen. This is different then peripheral edema from poor circulation or cardiovascular issues. This is a kind of full body fullness.
The same supplements DIM, flax ligands, and EPA can help with the bloating from hormone replacement therapy. Also lowering your hormone replacement therapy can help.
The third most common side effect of hormone replacement therapy is headaches.
Hormonal headaches are partially due to increased blood flow to the brain also due to some of the same issues that's causing bloating.
These hormonal headaches can be tension headaches or migraine headaches.
Hormonally induced migraine headaches respond well to sublingual B12. Taking B12 prophylactically, meaning every day, can help prevent migraine headaches. You can also take extra B12 when you're feeling headach-y.
Genesis Gold® can help to optimize hypothalamic function and optimize hormone metabolism so you do not have as many side effects from hormone replacement therapy.
If you have questions, please join us in our Hormone Reboot Training.
Frequently Asked Questions
Why does HRT cause breast tenderness?
Breast tenderness on HRT happens because estrogen and progesterone naturally stimulate breast tissue. It can be more pronounced if the dose is higher than you need, if estrogen and progesterone are out of balance, or if your body favors more inflammatory forms of estrogen when metabolizing it. Too much progesterone can also contribute. Because the fix often involves adjusting your regimen, persistent breast tenderness is worth reviewing with your prescriber.
How can I reduce breast tenderness from HRT?
The most direct step is discussing your dose and hormone balance with your prescriber, since an adjustment often resolves it. Supporting healthy estrogen metabolism may also help — some providers recommend cruciferous-vegetable compounds like indole-3-carbinol (I3C) or DIM, along with flax lignans, omega-3s, and attention to gut health, which influences how hormones are cleared. Because supplements can interact with hormone therapy, use them only under the guidance of your provider.
Why does HRT cause bloating and fluid retention?
Bloating and fluid retention on HRT usually happen when estrogen is high relative to progesterone, causing the tissues to hold onto water. This can feel like whole-body fullness — puffy fingers, swollen feet and ankles. It's different from swelling caused by circulation or heart problems, which needs separate medical evaluation. HRT-related fluid retention often improves by rebalancing or lowering the hormone dose, which is a conversation to have with your prescriber.
Can HRT cause headaches or migraines?
Yes. Hormonal headaches on HRT can occur from increased blood flow to the brain and the same hormone-balance and metabolism factors behind bloating. They can be tension-type or migraine headaches. Because hormone-related headaches can sometimes signal that a regimen needs adjusting — and because migraines have specific medical considerations, including for HRT choice — it's important to discuss new or worsening headaches with your healthcare provider rather than self-managing.
Does estrogen metabolism affect HRT side effects?
Yes. How your body breaks down estrogen influences side effects. Estrogen can be metabolized toward less inflammatory forms (like 2-hydroxy estrone) or more inflammatory ones (like 16-hydroxy estrone), and the balance affects symptoms like breast tenderness. Gut health matters too, because an enzyme called beta-glucuronidase can recirculate hormones that should be eliminated. Providers sometimes address these pathways with diet, targeted nutrients, and gut support as part of an individualized plan.
Hi Deborah
I enjoyed your interview with Dr. Eric. I had heard of GenesisGold, but I am on Methimazole and I hesitate to take any supplements which may interfere with the Methimazole. I don’t have Graves or Hashimoto or toxicosis, but I had extremely low .022 TSH results with normal T3-T4. The results have stabilized and are in the middle of the normal range. Hope you can answer my concern.
Thank you!
I start my hyperthyroid patients on Sacred Seven hypothalamic amino acids
Once we stabilize their TSH, then they can slowy add Genesis Gold.