Non-Small Cell Lung Cancer: Understanding Symptoms, Types, and Treatments
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: 5 Essential Facts About NSCLC
Non-small cell lung cancer (NSCLC) is the most common type of lung cancer, in which abnormal cells grow out of control in lung tissue. [1] Types include adenocarcinoma, squamous cell carcinoma and large cell carcinoma. [1] Smoking is the most significant risk factor. Symptoms include a persistent cough, chest pain and shortness of breath, though some people have none at first. [1]
Feature | Details |
Definition | The most common type of lung cancer, in which abnormal cells grow out of control in lung tissue. [1] |
Common types | Adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. [1] |
Main risk factor | A history of smoking is the most significant risk factor. |
Key symptoms | A persistent cough, chest pain, wheezing, and shortness of breath. Some people have no symptoms at first. [1] |
Where it spreads | Most often the brain, bones, liver, adrenal glands, lymph nodes, and skin. [1] |
What the research says
Screening high-risk people with low-dose CT lowers lung cancer deaths. In the National Lung Screening Trial, 53,454 people at high risk were randomly assigned to three yearly low-dose CT scans or chest X-rays. Low-dose CT cut lung cancer deaths by a relative 20.0% (95% CI 6.8 to 26.7). Most positive CT results were false alarms (96.4%), which is why screening is advised only for people at high risk. (Aberle et al., N Engl J Med, 2011 [2])
Immunotherapy can extend survival in advanced disease. In a trial of 305 people with metastatic NSCLC whose tumors had high PD-L1 levels, 5-year survival was 31.9% with pembrolizumab versus 16.3% with chemotherapy. Median survival was 26.3 months versus 13.4 months (hazard ratio 0.62). (Reck et al., J Clin Oncol, 2021 [3])
Targeted therapy after surgery can delay recurrence in people with an EGFR mutation. In 682 people with completely resected EGFR-mutated NSCLC, 90% of those with stage II to IIIA disease who took osimertinib were alive and disease-free at 24 months, versus 44% on placebo (hazard ratio 0.17). (Wu et al., N Engl J Med, 2020 [4])
What Is Non-Small Cell Lung Cancer?
Non-small cell lung cancer (NSCLC) occurs when abnormal cells form and multiply in the lungs. [1] It is one of two main types of lung cancer, the other being small cell lung cancer (SCLC). [1] NSCLC is by far the more common of the two. [1] Under a microscope, NSCLC cells are larger, and they typically grow more slowly than the small, round cells of SCLC, which tends to be more aggressive. [1]
Even with its slower growth, NSCLC is a serious condition. It often causes no symptoms in the early stages, so it is frequently found after the cancer has already spread (metastasized) to other parts of the body. [1] That is why early detection and treatment matter so much, and why doctors encourage screening for people at high risk.
What are the three main types of non-small cell lung cancer (NSCLC)?
Doctors group NSCLC into three main types, based on where the cancer starts and how the cells look under a microscope.
Type | Where it usually starts | Key points |
Adenocarcinoma | The outer parts of the lung [1] | The most common type. It is also the type most often seen in people who have never smoked. |
Squamous cell carcinoma | The central airways | Typically starts in the large airways (bronchi) near the center of the chest. |
Large cell carcinoma | Any part of the lung [1] | Can develop anywhere in the lungs and may grow and spread quickly. |
Less common types include sarcomatoid carcinoma and adenosquamous carcinoma. [1]
What are the symptoms of non-small cell lung cancer (NSCLC)?
Symptoms often do not appear until the disease has advanced. When they do, they are easy to mistake for other breathing problems, such as a lingering cold or bronchitis.
Common symptoms include a chronic cough that does not go away, coughing up blood, chest pain that may get worse with deep breathing, shortness of breath, wheezing, and hoarseness. Whole-body symptoms such as loss of appetite, unplanned weight loss, and tiredness (fatigue) can also be signs that something serious is going on. Any symptom that lasts for weeks deserves a visit to your healthcare professional.
What are the risk factors for non-small cell lung cancer?
Experts do not always know why one person develops NSCLC and another does not, but they have found several clear risk factors.
A history of smoking is the single most common risk factor for lung cancer. [1] Non-smokers can be affected too. Other known risks include exposure to radon (a naturally occurring radioactive gas), asbestos exposure, and exposure to metal and mineral dust. [1] A family history of lung cancer, respiratory conditions such as COPD or pulmonary fibrosis, and past radiation therapy to the chest or breast can also raise the risk. [1]
How Is NSCLC Diagnosed and Staged?
Diagnosis starts with a physical exam and a review of your symptoms and medical history. [1] If your healthcare professional suspects lung cancer, they will order tests to confirm it and to find its stage, which describes how far the cancer has spread.
Imaging tests such as chest X-rays and CT scans show the tumor, and PET scans and brain MRI help check whether it has spread. [1] A lung biopsy, in which a small sample of tissue is removed and studied in a lab, is usually needed to confirm the diagnosis. A bronchoscopy lets doctors look inside the airways with a thin, lighted tube. [1] Video-assisted thoracic surgery (VATS) may be used to get a closer look inside the chest. [1]
How is non-small cell lung cancer treated and managed today?
Treatment is personalized. It depends on the stage of the cancer, the type of NSCLC, and your overall health.
Surgical Options
For cancer that is only in the lung, surgery is often the first treatment. The surgeon removes the tumor and a small amount of healthy tissue around it. [1] Depending on the size and spread of the tumor, this may mean removing a small wedge of lung (wedge resection), a whole lobe (lobectomy), or, in some cases, an entire lung (pneumonectomy).
Systemic and Radiation Therapies
Many people receive a combination of treatments to improve their outcome:
Chemotherapy: Uses drugs that attack and kill cancer cells throughout the body. It is one of the most common NSCLC treatments. [1]
Immunotherapy: Uses drugs that boost your immune system so it can recognize and destroy cancer cells. [1]
Targeted therapy: Uses drugs designed to attack specific genetic changes in cancer cells, with less harm to healthy cells. [1]
Radiation therapy: Uses high-energy X-rays aimed at the cancer to shrink tumors and kill cancer cells. It can be used alone or with chemotherapy. [1]
What are recovery and the long-term outlook for non-small cell lung cancer?
The outlook for NSCLC depends mostly on how early it is found. Doctors often use the five-year survival rate, which is the share of people still alive five years after diagnosis. The figures below are estimates from the American Cancer Society, as cited by Cleveland Clinic. [1] They are general guides and cannot predict what will happen to any one person.
Recovery time varies. It depends on the size and location of the tumor, the type of treatment, and how well your body heals. [1] Some people recover in a few months, while for others it takes years. [1] NSCLC may be curable, especially when it is caught early, and even when it cannot be cured it is often treatable. [1] Many people manage their symptoms well for years.
What is the bottom line on non-small cell lung cancer?
Non-small cell lung cancer is serious, but it is not untreatable. Early detection, along with surgery, chemotherapy, immunotherapy, targeted therapy, and radiation, gives people more options today than ever before. If you or someone you love has a cough that will not go away, new shortness of breath, or other persistent breathing symptoms, the most important first step is to see a healthcare professional.
Worried about a lingering cough or your lung health? Talk to a healthcare professional. If you have a long history of smoking, ask whether lung cancer screening is right for you.
Frequently Asked Questions
What is the main difference between NSCLC and SCLC?
NSCLC grows more slowly and has larger cells under the microscope. SCLC is more aggressive and has small, round cells. NSCLC is also much more common.
Can non-smokers get non-small cell lung cancer?
Yes. Smoking is the leading cause, but exposure to radon, asbestos, and secondhand smoke, as well as genetics, can cause NSCLC in people who have never smoked. Adenocarcinoma is the type most often seen in non-smokers.
Is NSCLC curable?
It can be, especially when it is caught early and surgery can remove the whole tumor. When it cannot be cured, it is still treatable in many cases.
What is the most common symptom of NSCLC?
A cough that does not go away is one of the most commonly reported signs. Some people have no symptoms in the early stages.
What are the stages of NSCLC?
NSCLC is staged from I to IV, based on the size of the tumor and whether it has spread to lymph nodes or distant organs. Doctors also describe it as localized, regional, or metastatic.
How does immunotherapy work for lung cancer?
Immunotherapy drugs boost your immune system so it can find and attack cancer cells that were hiding from it.
What is targeted therapy?
Targeted therapy uses drugs designed to attack specific molecules or genetic changes that help cancer cells grow. It can attack those cells while causing less harm to healthy cells.
Can NSCLC spread to the brain?
Yes. The brain is one of the most common places NSCLC can spread. It can also spread to the bones, liver, adrenal glands, lymph nodes, and skin.
What is a lung biopsy?
A lung biopsy is a procedure in which a doctor removes a small piece of lung tissue so it can be checked for cancer cells under a microscope.
How long does recovery take after treatment?
It varies. Some people recover in a few months, and for others it takes years. It depends on the tumor, the type of treatment, and how your body heals. Ask your healthcare professional what to expect in your situation.
Does radon gas really cause lung cancer?
Yes. Radon is a naturally occurring radioactive gas and is a known risk factor for lung cancer. Radon exposure is widely recognized as the second leading cause after smoking.
What is a lobectomy?
A lobectomy is a surgery that removes one of the lobes of the lung. The right lung has three lobes and the left lung has two.
Can a chest X-ray always find lung cancer?
No. Small tumors can be missed on a chest X-ray, which is why CT scans are often used to get a more detailed view.
What is the survival rate for metastatic NSCLC?
The five-year survival rate for metastatic NSCLC is about 9%. Survival rates are estimates, and newer treatments such as immunotherapy and targeted therapy have improved outcomes for many people.
Should I get screened for lung cancer?
If you have a long history of smoking and are between the ages of 50 and 80, talk to your doctor about yearly low-dose CT screening. Screening is meant for people at high risk, not for everyone.
Related Reading
Adjuvant Therapy: What It Is, Types and Why It's Used explains adjuvant cancer therapy.
Learn more in our guide to Bronchoscopy: Why It's Done, What to Expect, Recovery and Risks.
Biomarker Testing for Cancer: What It Is, How It Works and What Results Mean explains how testing a tumor for gene changes and proteins helps match people with cancer to the treatments most likely to work.
Lung Cancer Screening: Who Should Get It, How Low-Dose CT Works and What Results Mean explains who qualifies for yearly low-dose CT screening, how the scan works and what the results mean.
References
Cleveland Clinic. Non-small cell lung cancer. Cleveland Clinic. Last updated January 16, 2025. https://my.clevelandclinic.org/health/diseases/6203-non-small-cell-lung-cancer
Aberle DR, Adams AM, Berg CD, et al. Reduced lung-cancer mortality with low-dose computed tomographic screening. N Engl J Med. 2011;365(5):395-409. PMID 21714641. https://doi.org/10.1056/NEJMoa1102873
Reck M, Rodríguez-Abreu D, Robinson AG, et al. Five-Year Outcomes With Pembrolizumab Versus Chemotherapy for Metastatic Non-Small-Cell Lung Cancer With PD-L1 Tumor Proportion Score ≥ 50%. J Clin Oncol. 2021;39(21):2339-2349. PMID 33872070. https://doi.org/10.1200/JCO.21.00174
Wu YL, Tsuboi M, He J, et al. Osimertinib in Resected EGFR-Mutated Non-Small-Cell Lung Cancer. N Engl J Med. 2020;383(18):1711-1723. PMID 32955177. https://doi.org/10.1056/NEJMoa2027071
Medical disclaimer
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions. Never disregard professional medical advice or delay seeking it because of something you read in this guide.
Comments