What are the symptoms of HER2-positive breast cancer?

The physical symptoms of HER2-positive breast cancer can be the same as for most types of breast cancer. If your doctor thinks you might have breast cancer, he or she is likely to take a biopsy (a sample of your breast tissue). If the biopsy shows you have cancer, a laboratory test can determine whether or not the cancer is HER2-positive -- meaning that the cells contain abnormally high levels of the HER2 protein, which can cause them to grow and spread faster than other types of cancer cells.

Many breast cancers are diagnosed before a woman notices any symptoms, through tests like mammograms. But you should call your doctor right away if you notice any of the following possible symptoms of breast cancer:
  • a new lump or mass in your breast or armpit
  • swelling of all or part of a breast 
  • breast skin that appears red, irritated, scaly and/or dimpled
  • breast or nipple pain
  • unusual nipple discharge (possibly bloody or pus-like yellow or green fluid)
  • nipple retraction (turning inward)
  • bone pain, weight loss, arm swelling or skin ulcers (symptoms of more advanced breast cancer)

Continue Learning about Breast Cancer Symptoms

Symptoms of Breast Cancer You Shouldn’t Ignore
Symptoms of Breast Cancer You Shouldn’t Ignore
Over 276,000 new cases of breast cancer are expected to be diagnosed in 2020. Aside from skin cancer, it is the most common form of cancer in the Unit...
Read More
What are the symptoms of lobular carcinoma in situ (LCIS)?
Cancer Treatment Centers of America (CTCA)Cancer Treatment Centers of America (CTCA)
Lobular carcinoma in situ (LCIS) does not cause symptoms and cannot be seen with a mammogram. This c...
More Answers
What is the connection between number of lymph nodes and breast cancer?
Dede BonnerDede Bonner
Studies show that there’s a connection between the number of lymph nodes involved and how aggressive...
More Answers
Is Hormone Therapy Effective for Breast Cancer?
Is Hormone Therapy Effective for Breast Cancer?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.