Breast cancer is a complex disease. And to make matters even more complex, there are multiple different kinds of breast cancer. This diversity means that there are also many different treatments for breast cancer. After you are diagnosed, your doctors will collaborate and recommend a unique course of treatment for you. Often, a component of that treatment is hormone therapy. Patients are often confused as to what hormone therapy is, how it works, and why it's a necessary part of their breast cancer treatment protocol.