Dr. Brendan McCarthy

Why Progesterone Makes Some Women Feel Worse

18 Dec 2025

Contributed by Lukas

Have you taken progesterone expecting calm, better sleep, or relief from PMS… only to feel more anxious, wired, or worse overall? You are not a fail...

Progesterone & Your Brain: The Missing Link

10 Dec 2025

Contributed by Lukas

In Episode 2 of this deep-dive hormone series, Dr. Brendan McCarthy—Chief Medical Officer of Protea Medical Center in Tempe, AZ—breaks down the pa...

Progesterone: The Breakthrough Women Deserve

04 Dec 2025

Contributed by Lukas

In today’s episode, I’m opening the first chapter of what I believe is the most important series I’ve ever created — a deep dive into progeste...

The Truth About Estrone: What Your Lab Work Isn’t Telling You

27 Nov 2025

Contributed by Lukas

Join Dr. Brendan McCarthy, Chief Medical Officer at Protea Medical Center in Tempe, Arizona, for a deep, practical breakdown of estrone—one of the m...

The Estrone Pathways That Predict Your Health: Labs Your Doctor Isn’t Running

20 Nov 2025

Contributed by Lukas

In this episode, Dr. Brendan McCarthy, Chief Medical Officer at Protea Medical Center in Tempe, Arizona, takes you deep into the science of Estrone me...

Estrone & Cancer: The Truth About “The Forgotten Estrogen”

12 Nov 2025

Contributed by Lukas

In Part 3 of the Forgotten Estrogen series, Dr. Brendan McCarthy—Chief Medical Officer of Protea Medical Center in Tempe, Arizona—dives deep into ...

Estrone Explained (Part 2): The “Forgotten Estrogen” and Why It’s Not the Bad Guy

06 Nov 2025

Contributed by Lukas

In this episode — Part 2 of our Estrone Series — Dr. McCarthy takes a deeper dive into estrone, the often misunderstood and overlooked estrogen. L...

Estrone Explained: How Lifestyle & Hormones Impact Women’s Health

30 Oct 2025

Contributed by Lukas

In this episode, Dr. Brendan McCarthy, Chief Medical Officer of Protea Medical Center, dives deep into estrone, one of the three key estrogens, and ex...

Healing the Divide Between MAHA & MAMA

23 Oct 2025

Contributed by Lukas

In this heartfelt episode, Dr. Brendan McCarthy dives deep into why women are turning away from conventional medicine and seeking care in alternative ...

Why Conventional Medicine Failed Women

15 Oct 2025

Contributed by Lukas

In this powerful episode, Dr. McCarthy continues his “Make America Healthy Again” series — exploring how conventional medicine has failed women ...

How Medicine Lost Its Way with Women

08 Oct 2025

Contributed by Lukas

In this episode, I dive deep into “Mama vs. Maha” — the Make America Medical Again movement versus the Make America Healthy Again movement — a...

Understanding the Divide in Modern Medicine

01 Oct 2025

Contributed by Lukas

Join Dr. Brendan McCarthy, as he dives into Part 2 of our series on understanding the divide in modern medicine. In this episode, Dr. McCarthy explore...

Why Patients Lose Trust in Medicine | Radical Transparency

25 Sep 2025

Contributed by Lukas

In this episode, Dr. Brendan McCarthy, Chief Medical Officer of Protea Medical Center, opens up about why so many patients lose trust in traditional, ...

Why I Practice Medicine Differently

17 Sep 2025

Contributed by Lukas

In this episode, I open up about my personal journey into medicine, how my son’s health crisis during medical school shaped the doctor I am today, a...

From Self-Silencing to Healing: Women's Health, Stress & Weight Gain

11 Sep 2025

Contributed by Lukas

In this powerful series finale, Dr. Brendan McCarthy, Chief Medical Officer of Protea Medical Center, shares a personal story about the humble beginni...

The Silent Stress That’s Harming Women’s Health

04 Sep 2025

Contributed by Lukas

Why do so many women struggle with autoimmune issues, fertility challenges, cardiovascular disease, and weight gain—despite following medical advice...

The Hidden Link Between Self-Silencing and Fertility

28 Aug 2025

Contributed by Lukas

In this episode, Dr. Brendan McCarthy, Chief Medical Officer at Protea Medical Center in Tempe, Arizona, explores how self-silencing—the cultural pr...

Self-Silencing in Women: The Hidden Link to Stress, Hormones & Heart Health

21 Aug 2025

Contributed by Lukas

Why do so many women struggle with stress-related health issues without ever speaking up? In this episode, Dr. Brendan McCarthy continues his series o...

Self-Silencing, Stress & Autoimmunity in Women

14 Aug 2025

Contributed by Lukas

In this episode, Dr. Brendan McCarthy explores how self-silencing behaviors—putting others first, suppressing your own needs, and avoiding conflict—...

The Hidden Cost of Self-Silencing: How It Impacts Women’s Health

07 Aug 2025

Contributed by Lukas

Welcome to the first episode in a five-part series on self-silencing and its profound effect on women’s health. I’m Dr. Brendan McCarthy, Chief Me...

Men & Fertility: What No One Tells You About Showing Up for Her

31 Jul 2025

Contributed by Lukas

In today’s episode, we’re talking about the role men play in fertility and women’s health. Too often, the fertility journey places the burden en...

Male Fertility & Emotional Avoidance: Why Men Need to Show Up

24 Jul 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this episode, Dr. McCarthy opens up about the psychological hurdles men face when it comes to...

Understanding PMS: A Guide for Men on Hormones, Relationships & Self-Silencing

17 Jul 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   PMS isn’t just a hormone issue—it affects relationships too. In this episode, Dr. McCarthy b...

Why Your Doctor Says You're "Fine" (When You're Actually Not) | Testosterone Q&A Pt. 2

10 Jul 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   Today he continues answering your most pressing questions about testosterone and hormone therapy...

Testosterone in Women: FSH, Hair Loss & Real Questions Answered

03 Jul 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this episode, I’ll be responding to your questions and comments. As always, thank you for b...

What We’re Learning About TRT and Breast Cancer Risk

26 Jun 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this episode, he dives deep into the powerful potential, and the necessary precautions, of te...

Why I Always Run Labs Before Hormone Therapy: The Real Risks of Skipping FSH

19 Jun 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this deeply personal episode, he shares why lab work—especially testing FSH (Follicle Stimu...

Why Perimenopausal Hormone Labs Do Matter — Debunking Dangerous Myths

12 Jun 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this video, Dr. Brendan McCarthy breaks down common misconceptions about hormone testing and ...

Should You Get HRT Without Lab Work? Why I Always Test First

05 Jun 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   Can you start hormone replacement therapy (HRT) or bioidentical hormones without lab testing? Te...

Testosterone in Women: Dosing, Labs & What Most Doctors Miss

29 May 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   This episode takes you deep into the real-world practice of prescribing testosterone therapy for...

The Truth About Testosterone in Women: What Your Doctor May Not Be Telling You

22 May 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   In this episode we dive deep into one of the most misunderstood and debated topics in hormone he...

Testosterone Therapy for Women: Breaking the Stigma

15 May 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   Today’s episode is all about testosterone therapy in women—a topic that’s often misunderst...

Progesterone Delivery Methods Explained: How It Actually Works in Your Body

09 May 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   Explore how progesterone travels through the body depending on the method of delivery—oral, tr...

Answering Your Hormone Questions: Progesterone Reactions, MTHFR, Estrogen Detox & More

01 May 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   Today’s episode is all about answering YOUR submitted questions — real concerns from real wo...

Progesterone, Testosterone & HRT Questions You’re Afraid to Ask

24 Apr 2025

Contributed by Lukas

Welcome to the podcast! In this deeply personal Q&A episode, Dr. Brendan McCarthy—Chief Medical Officer at Protea Medical Center—responds to y...

When Progesterone Backfires: Understanding Reverse Responders

17 Apr 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Welcome to Part 3. In this episode, Dr. McCarthy dives deep into the complex world of reverse respon...

When Progesterone Backfires: The Hidden Link Between Hormones, Anxiety & Trauma

09 Apr 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!   While progesterone is often prescribed for its calming and hormone-balancing effects, some women...

Why Progesterone Doesn’t Work for Everyone

04 Apr 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Today he addresses a topic many women have been waiting to hear more about: why some people don't to...

Migraine Series Q&A

29 Mar 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we're wrapping up our migraine series by answering your most frequently asked questi...

Triptans and Beyond: Understanding the True Causes of Migraines

21 Mar 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode, we dive into the complexities of migraines, particularly the role of triptans in tr...

Unlocking the Root Cause of Migraines: The Role of Progesterone and GABA

13 Mar 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we dive deep into the root causes of migraines in women, with a focus on the powerfu...

The Role of Estrogen in Migraines: Understanding the Link & Treatment Options

10 Mar 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we go over the connection between estrogen and migraines. He explores how hormone fl...

Understanding Headaches

10 Mar 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we dive into headaches—particularly how women suffer from them more frequently tha...

Your Voice Matters—Let’s Talk Menopause

20 Feb 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy, Chief Medical Officer of Protea Medical Center in Tempe, Arizona. Your feedback and comments shape t...

Menopause & Hormone Therapy: Treatment Pt. 2

14 Feb 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! We continue our menopause series as we dive into the treatment segment! Struggling with menopause sy...

Menopause & Hormone Therapy: Treatment Pt. 1

11 Feb 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! We continue our menopause series as we dive into the treatment segment! Struggling with menopause sy...

How to Recognize the Signs of Menopause: Symptoms & Diagnosis Explained

31 Jan 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Are you experiencing changes in your body and wondering if it might be menopause? I’ll guide you t...

Menopause Explained: An Introduction to Understanding the Journey

29 Jan 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, I'm giving a brief overview of what women experience during menopause and trying to f...

Why Is Treating Autoimmune Diseases So Challenging?

27 Jan 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Autoimmune diseases can be complex and unpredictable, making treatment a significant challenge. From...

Answering YOUR Questions About PMS | Everything You Need to Know! (Part 4)

16 Jan 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Got questions about PMS? I'm here to help! In this Q&A, we’re going over the most common (and ...

Balancing Hormones to Treat PMS: Effective Strategies Explained! (Part 3)

06 Jan 2025

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! This episode brings you Part 3, the treatment segment. Hormonal imbalances might be the key to under...

Is It PMS or Something Else? Diagnosing PMS Symptoms (Part 2)

29 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Are you experiencing mood swings, bloating, fatigue, or irritability and wondering if it's PMS — o...

Understanding PMS: An Intro to Symptoms, Causes, and Management (Introduction, Part 1)

28 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive into everything you need to know about PMS (Premenstrual Syndrome). An introd...

The Truth About Prostate Cancer & Testosterone: What Every Man Needs to Know

27 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Are testosterone and prostate cancer connected? In this video, we dive into the science and myths su...

The Evolution of Testosterone Replacement Therapy (TRT)

26 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Testosterone Replacement Therapy (TRT) has undergone a remarkable transformation over the years. Rec...

Ways for Managing Autoimmune Diseases Naturally & Effectively (Part 3)

23 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Struggling with autoimmune symptoms? In this video, we dive into the most effective ways to manage a...

Understanding Autoimmunity: A Guide to Diagnosis and Early Detection (Part 2.2)

22 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Autoimmune diseases affect millions worldwide, yet many struggle to get a timely diagnosis. In this ...

Understanding Autoimmunity: A Guide to Diagnosis and Early Detection (Part 2.1)

20 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Autoimmune diseases affect millions worldwide, yet many struggle to get a timely diagnosis. In this ...

Autoimmunity Explained: Understanding the Body's Defense Gone Wrong (Introduction, Part 1)

20 Dec 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we introduce the basics of autoimmunity, specifically focusing on how it affects wome...

Endometriosis Q&A: Doctor Answers to Your Most Asked Questions! (Part 4)

18 Oct 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Welcome to our Q&A session for the Endometriosis Awareness series! 🎥 In this episode, we dive...

Understanding and Treating Endometriosis (Part 3)

12 Oct 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive deep into endometriosis, a common but often misunderstood condition affecting...

How to Diagnose Endometriosis: Symptoms, Tests, and What to Expect (Part 2)

11 Oct 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive into the process of diagnosing endometriosis, a condition that affects millio...

Endometriosis 101: Understanding Symptoms, Causes, and Treatment (Introduction, Part 1)

10 Oct 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, I provide an introduction to endometriosis, a common but often misunderstood conditio...

Does Vitamin D Prevent Infection from Surgery? 🦠💊

09 Oct 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we explore whether Vitamin D can help prevent infections after surgery. Vitamin D is ...

Understanding Infertility: Causes, Symptoms, and Treatment Options

16 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Infertility is a complex and often misunderstood condition that affects millions of couples worldwid...

A Cholesterol Myth: Separating Facts from Fiction for a Healthier You

13 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we tackle the misconceptions surrounding cholesterol and its impact on your health. O...

The CDC Is Finally Recommending Pain Management For Excruciatingly Painful IUD Insertions

12 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In a long-awaited update, the CDC is now recommending pain management for those undergoing intrauter...

Effective Strategies to Manage & Treat PCOS Naturally | PCOS Treatment (Part 3.3)

11 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive deep into proven strategies to manage and treat Polycystic Ovary Syndrome (PC...

Effective Strategies to Manage & Treat PCOS Naturally | PCOS Treatment (Part 3.2)

10 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive deep into proven strategies to manage and treat Polycystic Ovary Syndrome (PC...

Effective Strategies to Manage & Treat PCOS Naturally | PCOS Treatment (Part 3.1)

09 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Are you struggling with Polycystic Ovary Syndrome (PCOS) and looking for natural ways to manage your...

PCOS Explained: How to Identify and Diagnose (Part 2)

08 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, I dive into the essential information you need to know about diagnosing Polycystic Ov...

Understanding PCOS: Symptoms, Diagnosis, and Treatment Options Explained! (Introduction, Part 1)

07 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this comprehensive video, I delve into Polycystic Ovary Syndrome (PCOS), covering its symptoms, d...

Understanding Polycystic Ovary Syndrome (PCOS)

06 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive into the complex yet common condition known as PCOS (Polycystic Ovary Syndrom...

The Price of Medicine is BROKEN

05 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this video, we dive deep into the world of pharmaceuticals to understand why the cost of medicine...

Why Are Labs So Important?

04 Sep 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Hormone tests can help diagnose, monitor, and screen for a variety of conditions. They can be done a...

The Main Carnivore Guru Calls It Quits

30 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we go over Paul Saladino who quit the carnivore diet due to health issues. His book ...

The Carnivore Diet Gives You Diabetes?

29 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Are you curious about how the Carnivore Diet might impact diabetes management? In this video, we exp...

A Cure for Type 2 Diabetes!?

17 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! For patients battling diabetes, a group of Chinese scientists and clinicians may offer a glimmer of ...

The Healthcare Industry is Broken, Let's Fix It (Pt.2)

17 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! We want to make a change in the healthcare and medical industry. For too long have patients been giv...

The Healthcare Industry is Broken, Let's Fix It (Pt.1)

16 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! We want to make a change in the healthcare and medical industry. For too long have patients been giv...

Hormones & PTSD

16 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Post-traumatic stress disorder (PTSD) is associated with multiple hormonal and neurotransmitter alte...

The Effects of Cortisol with PTSD

15 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! It’s estimated that 3.5% of the American population struggles with post-traumatic stress disorder ...

How PTSD can effect your health

15 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! It’s estimated that 3.5% of the American population struggles with post-traumatic stress disorder ...

Understanding Trauma & Weight Gain

14 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Research shows that healing trauma can improve overall health and well-being. Many of us struggle wi...

Post Traumatic Infenctions

13 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Post-traumatic stress disorder (PTSD) and other stress related disorders are associated with a subse...

Understanding Trauma in Medicine

13 Aug 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! We don’t talk about medical trauma all that often. But for many, trauma can cause many issues when...

Social Media Medical Specialists

19 Apr 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! A lot of misinformation can spread far too easily in todays existence of social media. Especially da...

Navigating Hormone Replacement Therapy

09 Apr 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Because hormones control anxiety, appetite, body temperature, brain function, heart rate, metabolism...

Endometriosis: Everything You Need to Know

08 Apr 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Endometriosis is a significant health problem affecting 1 in 10 people of childbearing age. But it’...

The Birth Control Pill (Part 3)

07 Apr 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Back in the 50's women wanted birth control to reclaim their bodies, and now they want better birth ...

The Birth Control Pill (Part 2)

07 Apr 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Back in the 50's women wanted birth control to reclaim their bodies, and now they want better birth ...

The Birth Control Pill (Part 1)

23 Mar 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Back in the 50's women wanted birth control to reclaim their bodies, and now they want better birth ...

Labs for Women

23 Mar 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! A hormone test for women can reveal important information about your health. These tests can detect ...

A Guide to Low Libido

23 Mar 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! It’s normal for women’s libido, or sex drive, to fluctuate across time, especially because of ma...

Hormone Treatment for Men vs Women #womenshealth

26 Feb 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! One thing everyone knows for sure is that men and women are very different. And they are different i...

The Misogyny of Medicine, Oral Estrogen Edition

03 Feb 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy!It is very popular to vilify estrogen these days. The most obvious reason is the result of several se...

Treating High Cholesterol with Pregnenolone?

02 Feb 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Today, cholesterol-lowering drugs are the most commonly prescribed medications in the United States....

Liver Health & Hormones: Everything You Need to Know!

01 Feb 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! One of the liver’s roles is to help regulate the balance of sex hormones, thyroid hormones, cortis...

Can Cervical Cancer be Prevented?

31 Jan 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! In this episode we go over Hormone Replacement Therapy as a whole. What it can do for you and its po...

BRCA Positive Gene and Taking Hormones

15 Jan 2024

Contributed by Lukas

Welcome to the podcast with Dr. Brendan McCarthy! Hormones can stimulate some breast cancer cells to grow. Hormone therapy works by either lowering th...