Talking Tamoxifen: From Fear to Finding My Way

For decades, tamoxifen has been a cornerstone of breast cancer treatment and prevention, saving countless lives. Its ability to block estrogen’s action in breast tissue has made it a breakthrough therapy for estrogen-receptor-positive breast cancer, and it’s used to treat metastatic disease, reduce recurrence after surgery and radiation, and lower cancer risk in women with genetic mutations, strong family histories, or other high-risk factors.

“Tamoxifen remains an excellent and comparatively well tolerated option for low-risk women with early-stage estrogen driven breast cancer and for breast cancer prevention,” says Lauren Oshry, M.D., a breast medical oncologist at Sylvester Comprehensive Cancer Center, part of UHealth – University of Miami Health System. “It is a mainstay of breast cancer therapy.”

The medication I feared most

I knew all of that when I was diagnosed with early-stage, estrogen-receptor-positive breast cancer and my doctors told me that at least five years of tamoxifen would be part of my treatment plan. Still, knowing something is lifesaving doesn’t mean embracing it comes easily.

I had heard cautionary stories about tamoxifen from other survivors on blogs, discussion boards, and in conversations. I worried I wouldn’t feel like myself, and that my side effects would be minimized or dismissed.

In my mind, tamoxifen loomed as the hardest part of treatment, making me far more anxious than having a lumpectomy and radiation.

When I met with my medical oncologist, he confirmed that five years of tamoxifen was the standard of care for me, as a premenopausal woman. (Post-menopausal women might be given different anti-estrogen medications, such as aromatase inhibitors or selective estrogen receptor degraders.)

As I shared my worries about tamoxifen’s potential side effects, my doctor drew a simple chart on the whiteboard in the exam room, showing how dramatically tamoxifen could reduce my risk of dying from breast cancer over the next 30 years. At 50 years old, that perspective mattered. I agreed to take tamoxifen — but not without asking a lot of questions.

Fortunately, my oncologist really listened. He took my fears seriously and walked me through strategies for managing potential side effects before I even started the medication. That conversation — and his empathy — helped me move forward.

Starting tamoxifen with intention

Two weeks after finishing radiation, I took my first tamoxifen pill. At the suggestion of my acupuncturist, I tried to welcome the medication rather than dread it. Each morning, I said out loud, “I welcome you into my body to do your job.” Sometimes I laughed at myself, but it helped shift my mindset from fear to healing.

I was already in perimenopause, so the possibility of entering menopause sooner didn’t feel alarming. I also live with fibromyalgia, which meant I was already using medications and strategies that overlap with how joint and muscle pain from tamoxifen are often managed.

Rather than waiting for side effects to appear, I took a proactive approach to preventing them: regular cardio and strength training, yoga and tai chi, good sleep habits, and an anti-inflammatory, nutrient-dense diet supported by supplements like calcium, vitamin D, vitamin K, and magnesium.

For a while, things were relatively smooth. Then, a few months in, side effects began to appear — not dramatically, but persistently enough that I had to learn how to live with them.

Living with tamoxifen’s side effects

Some of what I experienced mirrored what might have happened with menopause alone. Some felt distinctly tamoxifen-related. None were catastrophic — but all required attention.

My already-unpredictable periods became even less predictable, disappearing for months and then briefly returning. Hot flashes and night sweats also started up, particularly at night, when my body temperature seemed to ignore logic altogether. So far, I have managed these with cooling sheets, moisture-wicking sleepwear, strategic layering and drinking cold water. To be clear: I have not experienced the hot flashes and multiples-times-per night sweating that many women experience. If I do, I’ll be talking with my doctor about the various evidence-based non-hormonal therapies that can help.

Reflux and dry mouth were more surprising side effects. The reflux became severe enough to send me to a gastroenterologist, though testing showed no lasting damage. Through medication, dietary changes, timing my meals, short evening walks, and using alginate products, I eventually got it under control. Dry mouth, which I hadn’t recognized at first, turned out to be contributing to the problem and once addressed, made daily life far more comfortable.

Vaginal and vulvar dryness, along with occasional urinary discomfort, were managed with carefully vetted over-the-counter moisturizers and lubricants recommended through Sylvester’s sexual health guidance. Finding the right products made a meaningful difference.

Emotionally, I noticed changes, too. I’ve always been even-keeled, but my moods grew rockier. Between perimenopause, cancer, life stress, and tamoxifen itself, there were days when my feelings felt bigger and less predictable.

Therapy, honest conversations with friends, breathing exercises and reminders to be gentle with myself became essential tools.

Pain and fatigue have been the most ongoing challenges. Some days, it feels like every old injury speaks up at once. Strength training is the most evidence-backed tool for combatting pain, while cardio shows more evidence for fatigue. I try to keep up with both, even when it’s the last thing I want to do. Physical therapy, acupuncture, pain specialists, topical treatments, heat, ice and work with a nutritionist have all helped me reclaim my energy and reduce my pain. Improvement has come slowly, but it has come.

“We appreciate that many women experience side effects that can make the recommended five-year, or sometimes 10-year, course of treatment with tamoxifen very challenging,” Dr. Oshry says. “We have a growing number of effective approaches to manage side effects.”

I’m managing my side effects, and optimistic that I will continue to feel better. I also know that many women experience much more significant and disruptive side effects. Dr. Oshry notes that research is ongoing into new ways to manage side effects, as well as exploring the potential of lower doses of tamoxifen for some patients. “Sylvester is currently participating in a national trial evaluating a lower dose of tamoxifen in certain early-stage hormone-receptor-positive breast cancers,” she says.

Choosing not just survival, but quality of life

There have been days when simply getting through work, meals, movement and relationships has felt like too much. I’ve cried in the bathtub more than once.

Tamoxifen asks something of me nearly every day. But it also gives something back: time.

With support from my clinicians and a willingness to experiment, advocate for myself and keep adjusting, I feel better now than I did a few months ago. Not perfect, but better. And improving.

Cancer survivorship, I’ve learned, isn’t about being grateful to be alive and accepting whatever comes next. As Sylvester clinicians often remind me, the goal isn’t just survival. It’s living well.

Tamoxifen is part of my cancer journey — not the whole story, but a meaningful chapter. And I’m determined not to settle for being alive, but to keep pushing toward feeling whole again.

If you are experiencing side effects from tamoxifen, aromatase inhibitors or medically-induced menopause whether mild or highly disruptive ask your oncologist to refer you to Sylvester’s survivorship support services or breast cancer survivorship clinic. Or, contact Survivorship Care directly by calling 305-243-4922 or emailing [email protected].

Written by Rochelle Broder-Singer. 

Tags: Dr. Lauren Oshry, hormone therapy for estrogen receptor positive breast cancer, Sylvester Comprehensive Cancer Center, tamoxifen side effects breast cancer, tamoxifen treatment experience