Short answer · Medically reviewed summary · Last updated: 2026-05-08
Lung cancer is a condition characterized by the uncontrolled growth of abnormal cells in one or both lungs, which can interfere with the body’s ability to exchange oxygen and carbon dioxide. While it is a global health concern, the 53 members of our DiseaseMaps community living with lung cancer represent the diverse, personal experiences behind these clinical statistics. What are the main types of lung cancer? Clinicians classify lung cancer into two primary categories based on how the cells look under a microscope.
What is Lung cancer
What is Lung cancer? Plain-language, medically reviewed definition plus the lived reality told by patients.
Lung cancer is a condition characterized by the uncontrolled growth of abnormal cells in one or both lungs, which can interfere with the body’s ability to exchange oxygen and carbon dioxide. While it is a global health concern, the 53 members of our DiseaseMaps community living with lung cancer represent the diverse, personal experiences behind these clinical statistics.
What are the main types of lung cancer?
Clinicians classify lung cancer into two primary categories based on how the cells look under a microscope. Understanding these types is essential because they respond to different treatments:
- Non-Small Cell Lung Cancer (NSCLC): The most common form, accounting for approximately 85% of cases. It includes subtypes like adenocarcinoma, squamous cell carcinoma, and large cell carcinoma.
- Small Cell Lung Cancer (SCLC): This type accounts for about 15% of cases; it tends to grow and spread more rapidly than NSCLC and is strongly associated with a history of smoking.
How does lung cancer affect the body?
Lung cancer primarily impacts the respiratory system by disrupting the function of the alveoli (tiny air sacs). As tumors grow, they can obstruct airways, cause fluid buildup, or spread to nearby lymph nodes and other organs. Unlike localized infections, lung cancer involves complex genetic mutations that cause cells to ignore signals to stop dividing, eventually forming masses that impede healthy lung tissue.
Who is typically affected by lung cancer?
While lung cancer is frequently associated with tobacco use, it can affect anyone, including non-smokers. The average age of diagnosis is approximately 70 years old. Factors such as exposure to radon, asbestos, air pollution, and family history play significant roles in the development of the disease. Geographic prevalence varies based on environmental factors and historical smoking rates within specific populations.
How is this different from other respiratory conditions?
Unlike chronic obstructive pulmonary disease (COPD) or asthma, which are generally inflammatory or obstructive in nature, lung cancer is a malignant neoplasm. It is differentiated by the presence of metastatic potential, meaning the cells have the ability to invade surrounding tissues or travel through the bloodstream to distant sites like the brain, bones, or liver.
Next steps
- Consult a thoracic oncologist or pulmonologist to discuss personalized screening or diagnostic options.
- Connect with the 53 members of the DiseaseMaps community to share experiences and find emotional support.
- Request genetic testing on biopsy samples to identify specific mutations that may qualify you for targeted therapies.
Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding any medical condition.
References
- NIH National Cancer Institute: Lung Cancer (PDQ®) – Health Professional Version
- American Cancer Society: What Is Lung Cancer?
- World Health Organization (WHO): Cancer Fact Sheets
- Orphanet: Rare Lung Diseases Database
