Lung cancer: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 24th, 2026.
Published on April 5th, 2026. Updated on August 28th, 2026.
Key Takeaways
Lung cancer is the leading cause of cancer death worldwide, and finding it earlier can improve treatment options and outcomes. Screening with low-dose CT may be recommended for some people at high risk, even if they have no symptoms; ask your doctor whether screening is appropriate for you.
Most lung cancers develop from smoking, but non-smokers can also get lung cancer from radon, secondhand smoke, or other causes
Lung cancer may cause a persistent cough, shortness of breath, or chest pain, but it often causes no symptoms in its early stages. These symptoms can have many causes and should be evaluated if they persist or worsen.
Two main types exist: non-small cell lung cancer (85% of cases) and small cell lung cancer (15% of cases)
Modern treatments include surgery, chemotherapy, radiation therapy, targeted therapy, and immunotherapy
Overview
Lung cancer occurs when cells in the lungs grow out of control and form tumors. This disease affects the organs that help you breathe and get oxygen into your blood. Lung cancer can start in any part of the lungs and may spread to other parts of the body.
About 235,000 people in the United States are diagnosed with lung cancer each year. It's the second most common cancer in both men and women. While smoking causes most lung cancers, about 10-15% of cases happen in people who never smoked.
The good news is that lung cancer treatment has improved dramatically in recent years. When caught early, many people live long, healthy lives after treatment. Understanding the warning signs and risk factors helps you know when to seek medical care.
Symptoms & Signs
Lung cancer symptoms often develop slowly and may seem like common respiratory problems at first. Many people don't notice symptoms until the cancer has grown larger or spread to other areas.
Primary Symptoms
Persistent cough that doesn't go away or gets worse over time, especially if you cough up blood
Shortness of breath during normal activities like walking or climbing stairs
Chest pain that feels sharp, dull, or aching and may worsen with deep breathing or coughing
Hoarseness or voice changes that last more than two weeks without a cold or other illness
Unexplained weight loss of 10 pounds or more without trying to lose weight
Extreme fatigue that doesn't improve with rest or interferes with daily activities
Recurring infections like bronchitis or pneumonia that come back after treatment
When to Seek Care
Contact your doctor if you have a cough that lasts more than three weeks or if you cough up any blood. Seek medical attention for persistent chest pain, unexplained shortness of breath, or significant weight loss without trying. Get emergency help for severe trouble breathing; severe, sudden, pressure-like, or crushing chest pain; or coughing up more than a small amount of blood.
When to Seek Immediate Care
Get emergency help if you have severe trouble breathing, chest pain that feels like pressure or crushing, or if you cough up large amounts of blood.
Causes & Risk Factors
Age
Most lung cancers occur in people over 65, with average diagnosis age around 70
Genetics
Family history of lung cancer increases risk, especially in first-degree relatives
Lifestyle
Current or former smoking, exposure to secondhand smoke, poor diet low in fruits and vegetables
Other Conditions
Previous radiation therapy to chest, exposure to asbestos, diesel exhaust, or other chemicals
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Diagnosis
Diagnosis
Medical History & Physical Examination
Your doctor will ask about your symptoms, smoking history, family cancer history, and exposure to harmful substances. They'll listen to your lungs with a stethoscope and check for swollen lymph nodes in your neck and under your arms. The physical exam helps identify signs that might suggest lung cancer.
Your doctor will also ask about your work history and where you've lived. Some jobs and locations have higher exposure to cancer-causing substances like asbestos or radon gas.
Diagnostic Testing
Chest X-ray shows abnormal masses or spots in your lungs, though small tumors may not appear on X-rays
CT scan of the chest provides detailed pictures and can find smaller tumors that don't show up on chest X-rays
PET scan uses radioactive sugar to find cancer cells, which use more sugar than normal cells
Bronchoscopy involves inserting a thin, flexible tube with a camera through your nose or mouth to look inside your airways
Biopsy removes a small piece of suspicious tissue for laboratory testing to confirm if cancer cells are present
Molecular testing checks cancer cells for specific gene changes that help determine the best treatment options
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Treatment Options
Treatment for lung cancer depends on the type of cancer, how far it has spread, and your overall health. Your medical team will work with you to create a treatment plan that fits your specific situation.
Established Treatment Options
Surgery removes the tumor and some surrounding healthy tissue, most effective when cancer hasn't spread beyond the lungs
Radiation therapy uses high-energy beams to kill cancer cells and may be the main treatment for people who can't have surgery
Chemotherapy uses medicines that travel through your bloodstream to kill cancer cells throughout your body
Advanced Treatments
Targeted therapy uses drugs that attack specific gene changes in cancer cells, often causing fewer side effects than chemotherapy
Immunotherapy helps your immune system recognize and fight cancer cells more effectively, works especially well for certain types of lung cancer
Combination treatments may include surgery followed by chemotherapy or radiation, or combinations of different drug therapies
Your healthcare team may also recommend follow-up imaging and evaluation of any new or persistent respiratory symptoms as part of ongoing care.
Living with the Condition
Daily Management Strategies
Focus on eating nutritious foods to maintain your strength during treatment. Small, frequent meals often work better than large meals if you're experiencing nausea or loss of appetite. Stay hydrated by drinking water throughout the day, and consider using a humidifier if dry air makes breathing more difficult.
Manage fatigue by planning rest periods between activities. It's normal to feel more tired than usual during treatment. Listen to your body and don't push yourself too hard on days when you feel weak.
Keep track of your symptoms and side effects in a journal. This helps your medical team adjust treatments and manage any problems that come up. Some people find that understanding their specific type helps them feel more in control.
Exercise & Movement
Gentle activities like short walks, stretching, or light housework can help maintain your strength and mood. Start slowly and gradually increase activity as you feel able. Swimming or water exercises are often easier on your body if you're feeling weak.
Avoid strenuous activities that make you very short of breath. Stop any activity if you feel chest pain, dizziness, or extreme fatigue. Talk to your healthcare team about safe exercise options for your specific situation.
Prevention
Quit smoking or never start smoking - it's the most important step you can take to prevent lung cancer
Avoid secondhand smoke by staying away from smoking areas and asking others not to smoke around you
Test your home for radon using inexpensive test kits available at hardware stores and online
Eat plenty of fruits and vegetables which contain antioxidants that may help protect against cancer
Limit exposure to harmful chemicals at work by following safety guidelines and using protective equipment
Get regular check-ups with your doctor, especially if you have risk factors for lung cancer
People with respiratory conditions like asthma should work with their healthcare providers to manage symptoms effectively. Understanding when to seek urgent care for respiratory symptoms can help prevent complications.
Frequently Asked Questions
Yes, about 10-15% of lung cancers occur in people who never smoked. Radon exposure, secondhand smoke, air pollution, and genetic factors can cause lung cancer in non-smokers. Family history and previous radiation therapy also increase risk.
Lung cancer often spreads quickly to other parts of the body through the bloodstream and lymph system. It's also closely linked to smoking, unlike many other cancers. Treatment approaches have changed dramatically with new targeted therapies and immunotherapy options.
Non-small cell lung cancer grows more slowly and is easier to treat when caught early. Small cell lung cancer spreads faster but often responds well to chemotherapy and radiation therapy. The type affects which treatments work best.
Survival depends on many factors including the stage at diagnosis, type of lung cancer, overall health, and response to treatment. When caught early, many people live for many years after diagnosis. Advanced lung cancer is more challenging, but new treatments are improving outcomes.
Most treatments cause some side effects, but they vary by person and treatment type. Common side effects include fatigue, nausea, hair loss, and increased infection risk. Your medical team can help manage side effects with medications and supportive care.
Still have questions?
Consult with a healthcare professional for personalized advice.