Metastatic breast cancer occurs when cancer cells spread from the breast to other parts of the body, most commonly the bones, lungs, brain, or liver1 . Nearly 30% of women diagnosed with early-stage breast cancer eventually develop metastatic disease, and about 10% have metastatic breast cancer at the time of their initial diagnosis1 2. Symptoms vary widely depending on where the cancer has spread, making awareness and timely medical evaluation critical for early detection and management3 .
Common Symptoms of Metastatic Breast Cancer
Metastatic breast cancer often causes general symptoms that affect the whole body. These symptoms can precede or follow the diagnosis of metastatic spread and significantly impact quality of life.
Fatigue
Fatigue is one of the most frequently reported and burdensome symptoms in metastatic breast cancer patients4 . It can be severe and persistent, affecting daily functioning and overall well-being4 . Fatigue may result from the cancer itself, treatment side effects, or complications such as bone metastases5 .
Lack of Appetite
Loss of appetite (anorexia) is common in metastatic breast cancer and can be caused by hormonal changes related to the tumor as well as side effects from treatments like surgery and medications5 . This symptom contributes to nutritional decline and worsens patients' strength and energy levels5 .
Extreme Weight Loss
Unintended weight loss often accompanies fatigue and loss of appetite in metastatic breast cancer5 . It may result from the cancer’s metabolic effects and treatment side effects. Weight loss can further reduce patients’ physical function and quality of life5 .
- Fatigue, loss of appetite, and weight loss are systemic symptoms that often signal metastatic progression and require proactive symptom monitoring and management4 56.
Symptoms by Metastasis Location
The symptoms of metastatic breast cancer depend largely on the organs affected by the spread of cancer cells. Breast cancer most commonly metastasizes to the bones, lungs, liver, and brain, each causing distinct clinical signs.
| Metastasis Location | Common Symptoms | Additional Signs |
|---|---|---|
| Bones | Persistent pain, fractures, numbness, weakness | Hypercalcemia causing confusion, fatigue9 83 |
| Lungs | Dry cough, shortness of breath, chest pain | Pleural effusion, frequent infections11 310 |
| Liver | Abdominal pain, swelling, jaundice | Loss of appetite, weight loss, itching3 10 |
| Brain | Headache, seizures, vision and speech problems | Behavioral changes, confusion, weakness13 143 |
In the Bones
Bone metastases are the most frequent site of distant spread in breast cancer and are associated with significant morbidity7 8. Symptoms include:
- Persistent bone or joint pain that does not improve with usual pain relief8 3.
- Increased risk of fractures due to weakened bone structure8 .
- Hypercalcemia (high calcium levels in the blood), which can cause confusion, muscle weakness, and fatigue9 10.
- Numbness, weakness, or difficulty walking if the spinal cord or nerves are compressed3 .
- Bone metastases commonly affect ribs, spine, pelvis, arms, and legs1 .
In the Lungs
Lung metastases can cause respiratory symptoms that may be mistaken for other lung conditions11 12. Common signs include:
- Persistent dry cough that does not go away1 3.
- Shortness of breath or difficulty breathing1 3.
- Chest pain or tightness3 .
- Frequent respiratory infections or pleural effusion (fluid buildup around the lungs) 10.
In the Liver
When breast cancer spreads to the liver, patients may experience symptoms related to liver dysfunction11 12. These include:
- Abdominal pain or discomfort, especially in the right upper abdomen under the ribs3 10.
- Abdominal bloating or swelling due to fluid buildup (ascites) 3.
- Loss of appetite and unexplained weight loss3 .
- Jaundice (yellowing of the skin and eyes) and itching3 10.
- Fatigue and a general feeling of being unwell3 .
In the Brain
Brain metastases are more common in certain breast cancer subtypes, such as HER2-positive and triple-negative breast cancer13 7. Neurological symptoms may include:
- Persistent and progressively worsening headaches, often worse in the morning14 3.
- Seizures or fits14 3.
- Vision problems or speech difficulties14 3.
- Dizziness, unsteadiness, or loss of balance and coordination3 .
- Behavioral changes, mood swings, confusion, and memory problems14 3.
- Weakness or numbness on one side of the body3 .
- Breast cancer can also metastasize to less common sites such as the skin, stomach, intestines, ovaries, uterus, bladder, and tissues behind the eye, causing site-specific symptoms1 3.
Healthcare providers cannot cure metastatic breast cancer, but they can recommend treatments that improve quality of life and help patients live as long as possible20 .
💡 Did You Know?
Metastatic breast cancer is breast cancer that has spread to another part of the body, most commonly the bones, lungs, brain, or liver. The process of cancer spreading is called metastasis1 .
Is Metastatic Breast Cancer Contagious?
Metastatic breast cancer is not contagious and cannot be spread from person to person through contact or proximity15 . Cancer cells do not behave like infectious agents such as bacteria or viruses.
- Extremely rare cases of cancer transmission have been reported in organ transplant recipients who received organs from donors with undiagnosed malignancies16 .
- Such transplant-related cancer transmission occurs in approximately 0.02% of transplants and does not affect the general non-contagious nature of metastatic breast cancer16 .
When to See Your Doctor
Early detection of metastatic breast cancer recurrence relies on patient awareness of new or worsening symptoms and prompt communication with healthcare providers17 18. It is important to seek medical evaluation if you experience:
- Persistent or unusual pain in the bones, back, or joints that does not improve with pain relief1 3.
- New or worsening shortness of breath, cough, or chest pain1 3.
- Abdominal pain, bloating, swelling, or unexplained weight loss3 .
- Neurological symptoms such as headaches, seizures, vision changes, confusion, or weakness14 3.
- Skin changes such as a persistent rash, lumps, or swelling near the breast, underarm, or collarbone3 .
- Diagnosis may involve blood tests, imaging scans (bone scan, MRI, CT), biopsies, or fluid removal from symptomatic areas1 219.
Patients often fear that treatments won’t do any good. In fact, there are things we can do to improve both the quality and quantity of life2 .
— Jenna Vanliere Canzoniero, M.D., M.S., Johns Hopkins Kimmel Cancer Center
Summary of Key Symptoms
Metastatic breast cancer symptoms vary widely depending on the location and extent of spread. Common key symptoms include:
- Fatigue, loss of appetite, and unintended weight loss reflecting systemic effects of cancer and treatment5 4.
- Bone pain, fractures, numbness, and hypercalcemia indicating bone metastases9 83.
- Persistent cough, shortness of breath, and chest pain related to lung involvement11 3.
- Abdominal pain, jaundice, and swelling signaling liver metastases3 10.
- Headaches, seizures, vision changes, and neurological deficits caused by brain metastases13 143.
- Skin changes, lumps, or swelling near the breast or lymph nodes may also occur3 .
- Treatment focuses on symptom control and improving quality of life, often using systemic therapies tailored to the cancer subtype and metastatic sites15 219.
