SOURCE-LINKED REFERENCECLINICIAN REVIEW PENDING

Breast cancer

Breast cancer develops when malignant cells grow within breast tissue. Subtypes defined by tumor receptors and stage guide treatment; breast lumps are not always cancer.

At a glance

Quick facts

Category
Cancer
What it is
Breast cancer develops when malignant cells grow within breast tissue.
Typical presentation
A new breast or underarm lump, changes in breast shape or skin, nipple discharge or a new persistent focal symptom may occur; some cancers are found by screening.
Assessment
Clinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.
Treatment approach
Depending on subtype and stage, treatment may involve surgery, radiation, endocrine treatment, chemotherapy, targeted therapy or immunotherapy.
Key safety concern
A new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

Names & terminology

Understanding the name

Breast cancer develops when malignant cells grow within breast tissue. Subtypes defined by tumor receptors and stage guide treatment; breast lumps are not always cancer.

Clinical reference

Clinical profile

Summary
CategoryCancer
What it isBreast cancer develops when malignant cells grow within breast tissue.
Typical presentationA new breast or underarm lump, changes in breast shape or skin, nipple discharge or a new persistent focal symptom may occur; some cancers are found by screening.
AssessmentClinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.
Treatment approachDepending on subtype and stage, treatment may involve surgery, radiation, endocrine treatment, chemotherapy, targeted therapy or immunotherapy.
Key safety concernA new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

Overview

Breast cancer develops when malignant cells grow within breast tissue. Subtypes defined by tumor receptors and stage guide treatment; breast lumps are not always cancer.

Symptoms and presentation

A new breast or underarm lump, changes in breast shape or skin, nipple discharge or a new persistent focal symptom may occur; some cancers are found by screening.

CLINICAL FEATURES

Presentation and warning signs

The pattern varies and cannot replace an individual assessment.

Clinical overview
Presentation
  • A new breast or underarm lump
  • changes in breast shape or skin
  • nipple discharge or a new persistent focal symptom may occur
  • some cancers are found by screening
Clinical assessment
  • Clinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management
  • Interpret results with history and examination
When to seek urgent care
  • A new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

Emergency symptoms and clinical severity should be assessed locally.

Clinical assessment and diagnosis

Clinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.

ASSESSMENT

How the clinical assessment proceeds

Exact investigations depend on the clinical context.

Clinical workflow
1Define the symptom patternA new breast or underarm lump, changes in breast shape or skin, nipple discharge or a new persistent focal symptom may occur; some cancers are found by screening.
2Assess disease or alternative causesClinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.
3Discuss care and monitoringDepending on subtype and stage, treatment may involve surgery, radiation, endocrine treatment, chemotherapy, targeted therapy or immunotherapy.

Treatment and management

Depending on subtype and stage, treatment may involve surgery, radiation, endocrine treatment, chemotherapy, targeted therapy or immunotherapy.

Treatment & care hub

Elements of care

Individual treatment is based on diagnosis, comorbidities and clinician assessment.

Management overview
Confirm diagnosisFirst step

Understand the underlying condition

Clinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.

Tailor treatmentIndividualized

Choose evidence-based management

Depending on subtype and stage, treatment may involve surgery, radiation, endocrine treatment, chemotherapy, targeted therapy or immunotherapy.

Monitor safetyImportant

Recognize warning signs

A new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

Diagnosis→Tailored care→Monitoring

Complications and when to seek help

A new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

EVIDENCE AND DATA

Interpreting population statistics

Comparable, disease-specific prevalence or incidence data have not yet been curated for this entry. No prevalence estimate is supplied.

MedlinePlus Health Topics ↗
Data availabilityNot quantifiedUse condition-specific epidemiology, not estimated figures
No unsupported regional or country comparison is presented.

Frequently asked questions

What is Breast cancer?

Breast cancer develops when malignant cells grow within breast tissue. Subtypes defined by tumor receptors and stage guide treatment; breast lumps are not always cancer.

How is it assessed?

Clinical examination, imaging and tissue biopsy establish diagnosis; receptor and stage assessment direct further management.

When should I seek urgent help?

A new persistent lump or concerning breast change needs timely clinical evaluation rather than watchful waiting for months.

Sources

  1. MedlinePlus, US National Library of Medicine — Breast cancer — health topic ↗
  2. NCI — Cancer types and care ↗

This is an editorial evidence summary awaiting independent clinician review. It is not a diagnosis, a treatment plan, or a substitute for personalized medical care.