If you have breast cancer, you’ll move through a series of steps that typically begins with a biopsy to confirm the diagnosis, followed by tests to determine the type and stage of the cancer, and then a treatment plan tailored to your specific situation. The process can feel overwhelming, but it follows a well-established path that doctors have refined over decades. Here’s what to expect at each phase.
How Breast Cancer Is Confirmed
A suspicious finding on a mammogram, ultrasound, or physical exam doesn’t mean you have cancer. It means you need a biopsy, which is the only way to confirm a diagnosis. The most common type is a core needle biopsy, where a doctor uses a thin, hollow needle to remove several tiny tissue samples, each about the size of a grain of rice. Imaging like ultrasound or mammography guides the needle to the right spot. The procedure is done with local anesthesia and doesn’t require a hospital stay.
If the biopsy confirms cancer, the tissue sample is tested further to determine exactly what kind of breast cancer you’re dealing with. This matters enormously because not all breast cancers behave the same way or respond to the same treatments.
Your Cancer’s Subtype Shapes Your Treatment
Pathologists test the biopsy tissue for specific receptors on the cancer cells. These receptors tell doctors what’s fueling the cancer’s growth, which directly determines which treatments will work best. There are three key markers:
- Hormone receptor status. About two-thirds of breast cancers have receptors for estrogen, progesterone, or both. These cancers use your body’s hormones to grow, which means they can be treated with medications that block hormone activity.
- HER2 status. Some cancers overproduce a protein called HER2 that promotes cell growth. These cancers tend to be more aggressive but respond well to targeted drugs designed to block that protein.
- Triple-negative. Cancers that lack all three markers (no hormone receptors, no HER2 overproduction) are called triple-negative. This subtype has the fewest targeted treatment options and generally carries a less favorable prognosis compared to other subtypes.
What Staging Tells You
After diagnosis, your doctors will determine the stage of your cancer, which describes how far it has spread. Staging is based on three factors: the size of the tumor, whether cancer has reached nearby lymph nodes, and whether it has traveled to distant organs. Stages range from 0 (abnormal cells that haven’t invaded surrounding tissue) through IV (cancer that has spread to other parts of the body).
Staging directly affects your outlook. According to data from the National Cancer Institute’s SEER program covering 2015 to 2021, the five-year relative survival rate for localized breast cancer (still confined to the breast) is about 86%. When cancer has spread to nearby lymph nodes or tissues, that rate is roughly 80%. For distant or metastatic breast cancer, the five-year survival rate is about 47%, though treatments continue to improve these numbers.
Surgery: Lumpectomy or Mastectomy
Most people with breast cancer will have surgery. The two main options are lumpectomy (removing the tumor and a margin of surrounding tissue while keeping most of the breast) and mastectomy (removing the entire breast). Research shows that for many early-stage cancers, long-term survival is similar for both approaches when lumpectomy is followed by radiation.
The choice depends on several factors: the size and location of the tumor relative to your breast, whether cancer appears in multiple areas of the same breast, whether you’ve had prior radiation to that area, and whether you carry a genetic mutation that raises your risk of a new cancer. Your own preferences also matter. Some people choose mastectomy to avoid the need for radiation or ongoing intensive screening. Others prefer lumpectomy to preserve as much of the breast as possible.
Recovery differs between the two. One finding worth noting: chronic pain lasting six months or longer was reported by about 64% of mastectomy patients compared to 78% of lumpectomy patients in one large study, possibly because lumpectomy is almost always paired with radiation, which can cause its own lasting discomfort. During lymph node surgery, your surgeon may remove one or more lymph nodes under the arm to check for cancer spread, which adds its own recovery considerations.
Radiation, Chemotherapy, and Hormone Therapy
Surgery removes visible cancer, but additional treatments aim to destroy any remaining cancer cells and reduce the chance of the cancer returning.
Radiation
If you have a lumpectomy, radiation to the breast is standard. It typically involves daily sessions over several weeks. The goal is to eliminate microscopic cancer cells that may remain in breast tissue after surgery.
Chemotherapy
Not everyone with breast cancer needs chemotherapy. It’s more likely to be recommended for larger tumors, cancer that has reached the lymph nodes, triple-negative breast cancer, or HER2-positive cancers. Chemotherapy is sometimes given before surgery to shrink a tumor, making it easier to remove. Side effects vary but commonly include fatigue, nausea, hair loss, and increased vulnerability to infections.
Hormone Therapy
If your cancer is hormone receptor-positive, you’ll likely take medication that blocks your body’s ability to produce hormones or prevents hormones from reaching cancer cells. This treatment typically lasts five years or more and has been shown to greatly reduce the risk of recurrence and death from breast cancer. A common approach is to take one type of hormone-blocking drug for two to three years, then switch to a different one for another two to three years.
Lymphedema After Treatment
One of the most common long-term side effects of breast cancer treatment is lymphedema, a condition where fluid builds up in the arm on the side where lymph nodes were removed. It can cause swelling, heaviness, tightness, pain, numbness, and reduced mobility in the shoulder, arm, or hand. About 3% of women who have only a sentinel lymph node biopsy (removing just one or two nodes) develop lymphedema within a year, compared to roughly 20% of those who have a more extensive lymph node removal.
The most evidence-based way to lower your risk is maintaining a healthy weight, since higher body mass index is one of the strongest predictors of lymphedema. Preventing skin infections on the affected arm also matters. Daily moisturizing with water-based, low-pH products helps keep skin intact and less vulnerable to infection. Contrary to what was long believed, vigorous exercise and air travel have not been proven to increase lymphedema risk.
What Happens If Breast Cancer Spreads
When breast cancer metastasizes, the most common sites are the bones, liver, and lungs. It can also spread to the brain or skin, though this is less frequent. Symptoms of metastatic breast cancer can include bone pain, abdominal pain, shortness of breath, persistent nausea, and deep fatigue that doesn’t improve with rest. A new lump in the breast or chest wall area can also signal a recurrence.
Metastatic breast cancer is treated differently than earlier-stage disease. The focus shifts from curing the cancer to controlling its growth, managing symptoms, and maintaining quality of life for as long as possible. Treatment may include chemotherapy, hormone therapy, targeted drugs, radiation to specific areas causing symptoms, or combinations of these.
Follow-Up After Treatment Ends
Once active treatment is complete, you’ll enter a monitoring phase that lasts years. The standard schedule involves follow-up visits every six months for the first five years. At each appointment, your doctor will perform a clinical breast exam with careful attention to the lymph nodes, chest wall, and abdomen, looking for any signs of recurrence. You’ll also have a diagnostic mammogram every year.
Between appointments, monthly breast self-exams help you stay familiar with how your body feels so you can notice changes early. If you’re taking hormone therapy that affects bone density, your doctor will check your bone health every two years and monitor cholesterol levels annually, since some of these medications can affect both.
The Role of Genetics
About 13% of women in the general population will develop breast cancer in their lifetime. For women who carry a harmful change in the BRCA1 or BRCA2 genes, that risk jumps to more than 60%. If genetic testing reveals you carry one of these mutations, several risk-reduction options exist beyond standard treatment for any current cancer.
Enhanced screening starts at a younger age and adds breast MRI to the usual mammography schedule. Some carriers choose preventive surgery, removing both breasts to dramatically lower the risk of a new cancer developing. Removing the ovaries and fallopian tubes is another option, which reduces both ovarian cancer risk and possibly breast cancer risk as well. For those who aren’t ready for surgery, certain medications may help lower the risk of hormone-sensitive breast cancers, particularly in BRCA2 carriers.