April 13, 2023

Do People With Early Lung Cancer Have Symptoms?

Knowing the signs (like a cough that won’t quit) may help some people detect lung cancer early

Physican listening to patient's lungs via stethescope.

Finding and treating lung cancer early usually leads to better results. Some people with early lung cancer may have symptoms, which can start them on the pathway to diagnosis and treatment.


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But often, cancer has gone beyond the early stages before symptoms appear. This delay in symptoms is one reason why lung cancer claims more lives than any other cancer type.

“Knowing the warning signs may help you find lung cancer early,” says pulmonologist Peter Mazzone, MD. “But there are other important steps you can take. If you’re at high risk, you may be eligible for lung cancer screening to find cancer before you have symptoms. And if you smoke, quitting smoking can help reduce your lung cancer risk.”

Dr. Mazzone explains the warning signs to look for and when you should get screened or tested for lung cancer.

Warning signs of lung cancer

Symptoms of lung cancer can vary from person to person. The main symptom is a cough. “Most of the time, a cough is due to another condition,” says Dr. Mazzone. See a healthcare provider if you have a cough that:

  • Doesn’t go away or gets worse over time.
  • Isn’t related to a known condition like allergies, a cold or asthma.
  • Produces bloody or rust-colored phlegm.

Other symptoms of lung cancer include:

  • Chest pain when breathing deeply, coughing or laughing.
  • Fatigue or tiredness.
  • Repeat bronchitis or pneumonia.
  • Shortness of breath (dyspnea).
  • Unexplained weight loss.

If lung cancer spreads outside of your lungs to other parts of your body, you may feel:

  • Bone pain.
  • Neurological symptoms like headaches, dizziness or seizures.
  • Shoulder or arm pain.
  • Swollen lymph nodes.

Whenever you feel “off” — when something just isn’t right — it’s a good idea to see a healthcare provider to get checked out. Unexplained pain, lumps, coughs or other symptoms could be signs of something serious.

Syndromes caused by lung tumors

Some lung tumors can cause groups of symptoms called syndromes. These symptoms could signal lung cancer:


Horner syndrome

A tumor in the upper lung can press on nerves to your eye and face, causing Horner syndrome. Symptoms typically affect one side of your face and include:

  • Decreased sweating.
  • Drooping eyelid.
  • Smaller pupil.

Superior vena cava syndrome

The superior vena cava is the large blood vessel that carries blood from your head and neck to your heart. A lung tumor pushing on the superior vena cava can cause this syndrome. The main symptoms are redness and swelling in your face and neck.

Paraneoplastic syndrome

Some lung cancers produce hormones or hormone-like substances that travel through your bloodstream, causing problems far from the tumor. Paraneoplastic syndromes are more common in people with small cell lung cancer (SCLC).

There are several paraneoplastic syndromes. An example is a syndrome of inappropriate antidiuretic hormone (SIADH). In SIADH, cancer cells make an antidiuretic hormone (ADH), which lowers sodium levels in your blood. Low sodium levels can lead to:

  • Confusion.
  • Cramps.
  • Fatigue.
  • Nausea and vomiting.
  • Muscle weakness.

Because the symptoms of paraneoplastic syndromes often seem unrelated, healthcare providers may not suspect lung cancer as a cause.

How early will you notice symptoms of lung cancer?

Whether you experience symptoms and when they occur may depend on the tumor’s:

  • Location.
  • Size.
  • Speed of growth.
  • Type.

For example, two of the most common types of non-small cell lung cancer (NSCLC) are squamous cell carcinomas and adenocarcinomas. Squamous cell cancer tends to occur toward larger breathing tubes, while adenocarcinomas are usually deeper in your lung.

“It’s not always the case, but a squamous cell tumor near a large breathing tube may be more likely to produce a cough with some blood in it,” notes Dr. Mazzone. “A deeper tumor of the same size may not cause any symptoms.”


When should you get screened or tested?

Screening and testing have different purposes:

  • Screening checks for cancer before you have symptoms.
  • Testing looks for the cause of symptoms after they have started.

Who should be screened for lung cancer?

The U.S. Preventive Services Task Force (USPSTF) recommends lung cancer screening if you’re between ages 50 and 80 and:

  • Have smoked at least 20 pack-years of cigarettes. (To calculate pack-years, multiply the number of packs you smoked each day times the number of years you smoked.)
  • Currently smoke or have quit smoking within the past 15 years.

When should you get tested?

Many people think they’re not at risk of lung cancer if they never smoked. But about 20% of people with lung cancer have no history of smoking.

Regardless of your smoking history, talk to a healthcare provider if you have symptoms with no known cause like:

  • A cough.
  • Coughing up blood.
  • Chest discomfort or pain.
  • Shortness of breath.
  • Unintentional weight loss.

Your provider will ask you about your medical history and perform an exam. They may order pulmonary function testing to check how well your lungs are working. Imaging tests, such as a chest X-ray or chest CT scan, are also helpful in diagnosing lung problems.

“Your symptoms may not be lung cancer, but they require a healthcare provider to check them out and discuss them with you,” states Dr. Mazzone.

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