How to Know Breast Cancer Symptoms: Signs to Check

You can know the symptoms of breast cancer by watching for any new change in the breast or armpit: a new lump, lumpiness or thickening; a change in the size or shape of one breast; puckering or dimpling of the skin like orange peel; redness, warmth or swelling of the breast skin; a nipple that has recently turned inward or scaly skin around it; nipple discharge, especially if bloody; or persistent pain in one spot. This list is not complete: any new or persistent change in the breast or armpit needs a medical check as soon as possible, even if it is painless, and sudden or quickly spreading redness or swelling needs medical review the same day. Breast cancer cannot be confirmed or ruled out at home; diagnosis depends on a medical examination, imaging and sometimes a biopsy.

This article explains each sign in detail, when a change needs a same-day medical review, how to do a breast self-exam properly, and which tests settle the diagnosis.

Breast cancer symptoms that need a doctor

Knowing the symptoms starts with knowing what is normal for your own breasts. If you notice any of the following, book a doctor's appointment as soon as possible rather than waiting to see whether it goes away:

• A new lump, lumpiness or thickening in the breast, in the armpit or near the collarbone, whether painful or painless, hard or soft.
• A change in the size or shape of one breast that was not there before, such as one breast sitting higher or looking a different shape.
• Puckering or dimpling of the skin so it looks like orange peel, or a pulling-in of part of the skin.
• Redness, warmth or swelling of the breast skin, especially over a large part of the breast.
• Nipple changes: a nipple that has recently turned inward or changed direction, scaly or flaky skin around it, a sore, or persistent itching.
• Nipple discharge that comes out without squeezing, especially if it is bloody or clear and from one breast only.
• Persistent pain in one spot of the breast or armpit that is not linked to monthly hormonal changes and does not go away.

The absence of pain is not reassuring: many breast cancers cause no pain at first. Equally, pain does not mean a lump is benign. There is no home rule that can rule cancer out, and only a doctor can decide whether a change needs imaging or a biopsy.

When does a change need same-day medical review?

If the breast suddenly becomes red, hot and swollen, or the redness spreads quickly, with or without fever, it needs medical review the same day. The cause may be a bacterial breast infection that needs prompt treatment, or a rare type called inflammatory breast cancer, which often appears without a distinct lump. It is not safe to wait and see which one it is.

Does every breast lump mean cancer?

No. Most breast lumps that are found turn out to be benign. Common causes include:

• Cysts: small fluid-filled sacs that can grow and shrink and may be tender.
• Fibroadenoma: a smooth, mobile benign lump, more common in younger women.
• Fibrocystic changes: a general lumpy feeling with tenderness that varies with monthly hormonal changes.
• Infections and abscesses: usually with warmth, redness and pain. A red, hot breast needs a same-day medical check, whatever the cause.
• Fat necrosis after an injury or bruise to the breast.

None of these can be told apart from cancer by touch at home, and even a doctor may need imaging or a biopsy to be sure. So the safe rule is simple: every new lump gets checked by a doctor.

How to know breast cancer symptoms with a self-exam

The aim of a self-exam is to learn how your breasts normally look and feel, so you notice any change early. Do it once a month on a fixed day, at a time when your breasts are least tender and swollen. The steps:

1. In front of a mirror: stand with your arms by your sides, then raise them above your head, then press your hands on your hips. Look for any difference in size or shape, puckering or dimpling of the skin, redness, or nipple changes.
2. Lying on your back: put a small pillow under your shoulder and examine the right breast with your left hand, then swap. Use the pads of your three middle fingers held together, moving in small circles with light, then medium, then firm pressure.
3. Cover the whole area: from the collarbone to below the breast, and from the middle of the chest to the armpit. Following a fixed pattern, such as vertical strips from top to bottom, helps you miss nothing.
4. The armpit: check the armpit carefully for any lump.
5. The nipple: look for any discharge that appears on its own, or any scaling or sore around it.
6. In the shower: soapy, wet skin lets your fingers glide and makes lumps easier to feel.

A self-exam is a way of paying attention, not a way of diagnosing. A normal self-exam does not rule out cancer and does not replace regular medical check-ups and mammograms at the right age.

Breast cancer symptoms in men

Breast cancer in men is rare, but it happens. The symptoms are similar to those in women: a usually painless lump behind or around the nipple, a nipple turning inward, nipple discharge, a sore or puckered skin, or a lump in the armpit. Many men mistake these signs for benign breast enlargement and delay getting checked. Any new lump in a man's chest also needs a medical check as soon as possible.

Symptoms that can appear if the disease spreads

In some advanced cases, symptoms can appear outside the breast if the cancer has spread, such as persistent bone pain, a persistent cough, gradually worsening breathlessness, yellowing of the skin and eyes, unexplained weight loss, or an unusual persistent headache. These symptoms have many causes other than cancer, but if they appear alongside a breast change, see a doctor promptly. Sudden or severe breathlessness, sudden weakness on one side of the body, sudden confusion, a seizure, a sudden severe headache, or back pain with new numbness or weakness in the legs or loss of bladder or bowel control needs emergency help immediately.

What to do if you notice a breast change

• Do not wait to see whether it disappears; book a doctor's appointment as soon as possible.
• Note when you first noticed the change and whether it has changed in size or shape since.
• Tell the doctor about any family history of breast cancer and any hormone treatment you take.
• Do not press or massage the lump, and do not try home remedies on it.
• Bring the results of any previous breast imaging, because comparison helps the doctor a great deal.

Which tests confirm or rule out the diagnosis?

When a change is found, assessment usually goes through several steps that the doctor chooses according to age and symptoms:

• Clinical examination: the doctor examines both breasts and armpits and asks about your medical and family history.
• Mammogram: the main breast X-ray test at most ages.
• Ultrasound: tells a fluid-filled cyst from a solid lump and is often used in younger women.
• MRI: in selected cases, such as people at high risk.
• Biopsy: the only test that confirms or rules out cancer and identifies its type if present.

Who is at higher risk, and when does screening start?

Breast cancer can affect any woman, but some factors raise the risk, including:

• Older age, with most cases occurring after 40.
• A first-degree relative, such as a mother, sister or daughter, with breast cancer.
• Known inherited gene changes, such as BRCA mutations.
• A previous breast cancer or certain abnormal changes in breast tissue.
• Radiation therapy to the chest at a young age.
• Excess weight, low physical activity, alcohol, and some types of hormone treatment.

Having a risk factor does not mean you will get breast cancer, and having none does not mean you are safe; many women with breast cancer have no clear risk factor. For women at average risk, most medical guidelines start screening mammograms in the forties, and the doctor decides when to start and how often to repeat them based on age and family history. Women with a strong family history or an inherited gene change may need to start earlier and have additional tests.

Why early detection makes a difference

When breast cancer is found early, the tumour is usually smaller and confined to the breast, so there are more treatment options and treatment may be less extensive. No treatment can guarantee a particular outcome for every patient, but studies show that treatment results are generally better the earlier the disease is found. That is why paying attention to any change, and not putting off a check-up out of fear or embarrassment, matters most.

Most changes that get checked turn out to be benign, so seeing a doctor early brings peace of mind in those cases, and gains time in the others.

Frequently Asked Questions

How can I know breast cancer symptoms at home?

You can notice symptoms with a monthly self-exam, by looking in a mirror and by touch, and by watching for any new or persistent change in the breast or armpit, including: a new lump, lumpiness or thickening; a change in the size or shape of one breast; puckering or dimpling of the skin; redness, warmth or swelling; nipple changes, a newly inverted nipple or scaly skin around it; nipple discharge; or persistent pain in one spot. This list is not complete: any new change needs a medical check as soon as possible, and sudden or quickly spreading redness or swelling needs medical review the same day. A normal self-exam does not rule out cancer and does not replace regular medical check-ups.

How can I tell breast cancer symptoms from a benign lump?

They cannot be told apart by touch at home. A painful, soft or mobile lump is not necessarily benign, and a painless lump is not necessarily cancer. A doctor settles it with a clinical examination and a mammogram or ultrasound, and a biopsy is the only test that confirms or rules out the diagnosis. So any new lump, and any new or persistent change in the breast or armpit, needs a medical check as soon as possible, and sudden or quickly spreading redness or swelling needs medical review the same day.

Is breast pain one of the breast cancer symptoms?

Breast pain is common and is usually linked to monthly hormonal changes or benign causes, and many breast cancers cause no pain at first, so the absence of pain is not reassuring. Persistent pain in one spot that is not linked to those changes and does not go away needs a medical check. Any new or persistent change in the breast or armpit, such as a lump or a change in shape, skin, nipple or discharge, also needs a medical check as soon as possible, and sudden or quickly spreading redness or swelling needs medical review the same day.

Is nipple discharge a breast cancer symptom?

It can be, but most nipple discharge has a benign cause. Discharge needs a medical check as soon as possible if it comes out without squeezing, is bloody or clear, or comes from one breast or one duct. Any other new or persistent change in the breast or armpit, such as a lump, a change in shape, skin or nipple, or persistent pain, also needs a medical check, and sudden or quickly spreading redness or swelling needs medical review the same day.

How can men know breast cancer symptoms?

Breast cancer in men is rare but possible, and the symptoms are similar to those in women: a usually painless lump behind or around the nipple, a nipple turning inward, nipple discharge, a sore or puckered skin, or a lump in the armpit. This list is not complete: any new or persistent change in a man's chest or armpit needs a medical check as soon as possible, even if it looks like benign enlargement, and sudden or quickly spreading redness or swelling needs medical review the same day.

When should I get a mammogram to check for breast cancer?

For women at average risk, most medical guidelines start screening mammograms in the forties, and the doctor decides when to start and how often to repeat them based on age and family history. Women with a strong family history or an inherited gene change may need to start earlier and have additional tests. Noticing any new change in the breast or armpit is a reason to see a doctor as soon as possible at any age, without waiting for routine screening.