October 14, 2026 — PatientTrac / Lumi Listens
Lumi Listens is a column from Lumi by PatientTrac. Lumi, the PatientTrac Companion AI, listens to the questions people with breast cancer (and those who love them) ask most, and answers in plain language. This Breast Cancer Awareness Month, we're listening to one of the hardest: where can breast cancer spread, and what should I watch for?
The facts below come from Breastcancer.org's article "Where Can Metastatic Breast Cancer Spread?" (written by Tyler Santora, reviewed by Kevin Fox, MD, updated June 15, 2026). Read it in full here: https://www.breastcancer.org/types/metastatic/resources/where-breast-cancer-spreads?utm_source=social&utm_medium=social&utm_campaign=social&utm_term=social&utm_content=MBC-Hub
"I've had breast cancer. Why does a new ache somewhere else matter?"
It's a fair question. Breastcancer.org explains that breast cancer can spread, or metastasize, to any area of the body, though some places are more common than others, and the symptoms differ depending on where it has spread. That's why the article says it's important to tell your doctor about any new pain or discomfort, even in a part of the body far from the breast.
A new symptom doesn't mean the cancer has spread; many aches have everyday causes. But it's always worth mentioning to the people caring for you.
"Where does it usually go?"
According to Breastcancer.org, breast cancer tends to travel to the bones, brain, liver and lungs first. Ductal breast cancer, which accounts for 80% of breast cancer cases, is most likely to spread to these sites.
"What might it feel like in the bones?"
Breast cancer can spread to any bone, but the article says it most often goes to the ribs, spine, pelvis, or the long bones of the arms and legs. The most common symptom is a sudden, noticeable new pain in these areas. One detail worth remembering: pain that feels just as bad, or even worse, when you rest or lie down can be a sign of a problem.
"And the lungs?"
Breastcancer.org notes that when breast cancer spreads to the lungs, it often doesn't cause symptoms. When it does, they can include pain or discomfort in the lung, shortness of breath and a persistent cough, which can be hard to tell apart from a cold. The article says many doctors recommend making an appointment for unusual symptoms that last more than a week or two.
"What about the liver?"
The liver, too, often shows no symptoms. Sometimes there is stomach pain, fatigue and weakness, nausea, weight loss or poor appetite, and fever.
"What signs could point to the brain?"
Breastcancer.org lists headache, persistent nausea or vomiting, loss of balance, weakness or numbness in the arms or legs, changes in speech or vision, changes in mood or personality, and memory problems. The article notes the risk is usually highest with more aggressive subtypes, such as HER2-positive or triple-negative breast cancer.
"Are there other places?"
Yes. The article also describes the skin (a change in skin color, a persistent rash, or firm lumps that don't go away) and the fluid around the spinal cord. It explains that lobular breast cancer can also spread to places such as the stomach, small intestine or colon, the ovaries or uterus, the bladder and ureter, and the tissues behind the eye. The full article lists the symptoms for each.
What Lumi would gently suggest
You're not expected to know whether a symptom matters. That's your care team's job. Yours is simply to notice it and say so.
- Notice what's new, getting worse, or not going away, and write it down the same day.
- Bring it to your care team by message, or on a list for your next visit, instead of waiting it out.
- If something feels sudden or severe, don't wait for the next appointment. Call your care team's after-hours line or seek emergency care.
How Lumi by PatientTrac can help
Lumi by PatientTrac is built around those habits. The daily log asks how you're doing (pain, breathing, appetite, energy, mood) and keeps your answers, so "it's been a couple of weeks" becomes something you can see, not guess. When a pattern needs attention, it prompts you to message your care team, with your log attached. You can also ask about your care plan and medications in plain language, in English, Spanish or French. Lumi doesn't diagnose and doesn't replace your care team. It helps you notice sooner, remember more, and get the right information to the right person.
This column is general information, not medical advice. Please talk with your own care team about any symptoms and about your care. Source: Breastcancer.org. This column is independent and has not been reviewed or endorsed by Breastcancer.org.
PatientTrac is not affiliated with or partnered with Breastcancer.org. This column is general information, not medical advice.
Every paid month gives $5 to breast cancer research.