Breast cancer: symptoms, treatment, and when to see a doctor
Last updated September 6, 2026.
Breast cancer is a growth of abnormal cells that starts in the ducts or lobules of the breast and can spread to lymph nodes and other organs if it is not treated. It often shows up first as a firm lump, a change in the shape of the breast, or a change in the skin or nipple, and it is confirmed with imaging plus a needle biopsy. Treatment is built around surgery, and depending on the tumor it may also include radiation, hormone blocking pills, chemotherapy, or HER2 targeted drugs. What changes urgency most is a lump or skin change that persists through a full menstrual cycle or keeps growing, since that moves you from watching to imaging within days.
What are the symptoms of Breast cancer?
- A new firm lump in the breast or armpit that does not move easily
- Dimpling, puckering, or thickening of the breast skin
- A nipple that turns inward, flattens, or changes shape
- Clear or bloody discharge from one nipple without squeezing
- Skin that looks red, scaly, or like orange peel over part of the breast
- One breast changing size or shape over weeks
- Breast pain in one spot that does not go away after a period
Tender lumpy areas in both breasts that swell before a period and settle afterward point more toward normal hormonal breast tissue or a cyst than toward cancer.
How does a doctor diagnose Breast cancer?
The story matters first: how long the change has been there, whether it moves with your cycle, whether it is in one breast only, and your age and family history. A clinician examines both breasts and the armpit and collarbone areas, feeling for how hard the lump is, whether it moves under the fingers, and whether the skin or nipple is pulled in. If anything is suspicious, the next step is imaging, usually a diagnostic mammogram plus ultrasound, and MRI in some cases. Imaging alone cannot confirm cancer, so a core needle biopsy is done on anything that looks abnormal, and a pathologist reports whether cancer cells are present. If they are, the sample is tested for estrogen and progesterone receptors and HER2, because those results decide which treatments will work. Staging scans and lymph node sampling follow to show how far it has spread.
How is Breast cancer treated?
- Surgery: Most people start with breast conserving surgery (lumpectomy), which removes the tumor and a rim of normal tissue, or mastectomy when the tumor is large or in more than one area. A sentinel lymph node biopsy is usually done at the same time to check whether cancer has reached the armpit nodes.
- Radiation therapy: Radiation is standard after a lumpectomy and is often given in daily sessions over about three to four weeks. It is also used after mastectomy when the tumor was large or lymph nodes were involved.
- Hormone blocking therapy: If the tumor is estrogen or progesterone receptor positive, you take a daily pill for at least five years, often longer. Tamoxifen is first line before menopause, and aromatase inhibitors such as anastrozole, letrozole, or exemestane are first line after menopause.
- Chemotherapy: Chemotherapy is used for higher risk tumors and is given in cycles over roughly three to six months, before surgery to shrink the tumor or after surgery to lower the chance of return. Common regimens combine a taxane such as paclitaxel or docetaxel with cyclophosphamide, sometimes with an anthracycline such as doxorubicin.
- HER2 targeted therapy: When the tumor is HER2 positive, antibody drugs such as trastuzumab, often with pertuzumab, are added alongside chemotherapy and then continued for about a year. Your heart function is checked with scans during treatment because these drugs can weaken the heart muscle.
When is Breast cancer an emergency?
A new lump is not an emergency, but some situations are. Call 911 for sudden shortness of breath, chest pain, coughing up blood, fainting, a seizure, or sudden weakness or slurred speech, since clots and spread to the brain can present this way. Go to the emergency room the same day for a temperature of 100.4 F or higher while you are on chemotherapy, for new back pain with leg weakness, numbness in the groin area, or trouble controlling your bladder or bowels, for confusion with heavy vomiting and thirst, or for a breast wound that keeps bleeding through dressings. Urgent care is a reasonable choice for spreading redness, warmth, or drainage around a surgical site when you have no fever and are not on chemotherapy. Book a clinic visit within about two weeks, not months, for any new lump, skin dimpling, inward turning nipple, or one sided bloody nipple discharge.
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Common questions
Does breast cancer hurt?
Usually not at first. The classic pattern is a painless, firm lump that does not move much when you press it, which is why pain is a poor way to judge whether a lump matters. Pain that comes and goes with your period, affects both breasts, and eases after bleeding starts is far more often normal hormonal change or a cyst. That said, some breast cancers do hurt, and inflammatory breast cancer can feel warm, sore, and swollen. A lump that lasts through a full cycle should be imaged whether or not it is tender.
I found a lump. How quickly do I need to be seen?
Aim for a clinic visit within about one to two weeks. Most breast lumps turn out to be cysts, fibroadenomas, or normal glandular tissue, so this is not an emergency room problem. The goal of the visit is an exam and a diagnostic mammogram with ultrasound, which is different from a routine screening mammogram. If you are under 30, ultrasound is often done first. Go sooner if the skin becomes red and hot with fever, or if the lump is growing week to week.
What does it mean if I get called back after a screening mammogram?
A callback means the radiologist saw an area that was not clear on the standard views and wants more pictures. Most callbacks lead to extra mammogram angles or an ultrasound and end with a normal or benign result. Some lead to a core needle biopsy, which is done with local anesthetic through a small nick in the skin and does not require an overnight stay. Callbacks are more common on your first mammogram, because there are no older images to compare against. Getting the extra imaging done promptly is the fastest way to settle it.
Can men get breast cancer?
Yes. Men have breast tissue behind the nipple, and cancer can start there. It usually appears as a hard, painless lump right under or beside the nipple, sometimes with nipple retraction, skin changes, or discharge. Because it is not expected, men often wait before getting checked, which delays diagnosis. The workup is the same: exam, mammogram and ultrasound, then core needle biopsy. Treatment follows the same categories, and most male breast cancers are hormone receptor positive, so tamoxifen is commonly used.
Does a family history mean I will get breast cancer?
No. Most people diagnosed with breast cancer have no family history of it, and most people with an affected relative never develop it. Family history does change your plan, though, especially if a close relative was diagnosed young, if there is ovarian or male breast cancer in the family, or if there is known BRCA1 or BRCA2 in a relative. In those cases your clinician may refer you for genetic counseling and start screening earlier, sometimes adding breast MRI to mammograms. Bring names, ages at diagnosis, and which side of the family, since that is what guides the decision.
What do the terms hormone receptor positive, HER2 positive, and triple negative mean?
They describe what the biopsy showed about the cancer cells, and they decide treatment. Hormone receptor positive means the cells grow in response to estrogen or progesterone, so daily hormone blocking pills such as tamoxifen or an aromatase inhibitor become a core part of treatment. HER2 positive means the cells carry extra copies of a growth protein, which is targeted with antibody drugs such as trastuzumab given with chemotherapy. Triple negative means none of those three targets are present, so chemotherapy, and in some cases immunotherapy, does the main work. None of these labels tell you the stage, which is a separate measure of size and spread.
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