Medically reviewed by: Antoinette Wozniak, MD
Lung cancer often causes no symptoms in its earliest, most treatable stages. When symptoms do appear, the most common are a cough that does not go away or changes, chest pain, shortness of breath, coughing up blood, hoarseness, and unexplained weight loss. Because these signs overlap with everyday illnesses, they are easy to dismiss — but a symptom that persists for more than two to three weeks is worth discussing with a doctor.
Lung cancer is the leading cause of cancer death in the United States, and most cases are still found after the disease has spread. According to the American Cancer Society, about 72% of lung cancers are diagnosed at a regional or distant stage, when they are harder to treat. One reason is that the lungs themselves have very few nerve endings, so a tumor can grow for a long time without causing pain. Knowing what to watch for — and acting on it rather than waiting — is one of the few parts of this disease within a person’s control.
This guide explains the common symptoms of lung cancer, the subtler early signs, how the disease can show up elsewhere in the body when it spreads, and the practical question that matters most: when is it time to see a doctor. It also covers who qualifies for lung cancer screening, which can catch the disease before any symptoms appear.
What are the most common symptoms of lung cancer?
Most symptoms of lung cancer relate to the lungs and airways, but the disease can also cause symptoms throughout the body. The signs below are the ones most often reported by patients and most frequently listed by the American Cancer Society and the American Lung Association. Having one or more does not mean a person has lung cancer — these symptoms are far more often caused by infections, asthma, allergies, acid reflux, or other conditions — but symptoms that persist, worsen, or have no clear explanation should be evaluated by a clinician.
- A cough that won’t go away or that changes. A new cough lasting more than two to three weeks, or a long-standing cough that becomes more frequent, deeper, or painful. This is one of the most common first symptoms.
- Coughing up blood or rust-colored phlegm. Even a small amount of blood (called hemoptysis) should be checked promptly, even though it has many non-cancer causes.
- Chest, shoulder, or back pain. Often a dull ache that may be constant or may worsen with deep breathing, coughing, or laughing.
- Shortness of breath. Feeling winded during activities that were not a problem before, sometimes because a tumor narrows an airway or fluid builds up around the lung.
- Wheezing. A new whistling sound when breathing, which can occur when an airway is blocked or narrowed.
- Hoarseness. A raspy or strained voice that does not resolve.
- Frequent or lingering chest infections. Bronchitis or pneumonia that keeps returning or won’t fully clear up.
- Unexplained weight loss and loss of appetite. Losing weight without trying, or simply not feeling hungry.
- Fatigue and weakness. Persistent tiredness that rest does not fix.
The Lung Cancer Research Foundation uses the word BREATHE as a memory aid for several of these warning signs: Blood when you cough or spit; Recurring respiratory infections; Enduring cough that is new or different; Ache or pain in the shoulder, back, or chest; Trouble breathing; Hoarseness or wheezing; and Exhaustion or unexplained weight loss. If you notice any of these and they do not go away, make an appointment with your doctor.
What are the early signs of lung cancer?
There is often no reliable ‘early’ symptom — and that is exactly what makes lung cancer so dangerous, and why screening matters so much. When early symptoms do occur, they tend to be mild and nonspecific: a slight but persistent cough, getting winded more easily on stairs or walks, or a chest infection that takes longer than usual to clear. People understandably attribute these to aging, allergies, a cold, smoking, or simply being out of shape.
The most useful rule is to pay attention to duration and change rather than to any single symptom. A respiratory symptom that lasts beyond two to three weeks, or any clear change from a person’s normal baseline — a cough that sounds different, breathlessness that is new, a voice that stays hoarse — is worth a conversation with a clinician. This is especially true for anyone with a history of smoking or other risk factors, but it applies to everyone, because lung cancer also occurs in people with no smoking history.
Can you have lung cancer with no symptoms?
Yes. Many people with early lung cancer feel completely well, and some tumors are found only by accident, on a scan ordered for an unrelated reason such as a heart workup or an injury. Because the lungs have so few pain-sensing nerve endings, a tumor can grow quietly for months. This is the central reason lung cancer screening exists: a yearly low-dose CT scan can find cancer in people who have no symptoms at all, when it is small and far more treatable. For people at high risk, waiting for symptoms is waiting too long — screening is the better path.
Do lung cancer symptoms differ by tumor type or location?
Symptoms can vary depending on where a tumor sits and how it grows. A tumor in or near a large central airway is more likely to cause a cough, wheezing, coughing up blood, or repeated infections relatively early, because it affects airflow. A tumor in the outer part of the lung may cause few symptoms until it is larger or presses on the chest wall, causing pain. A tumor at the very top of the lung can press on nearby nerves and cause shoulder or arm pain, or a group of signs known as Horner syndrome (a drooping eyelid and a smaller pupil on one side of the face). These patterns are not diagnostic on their own, but they help explain why two people with lung cancer can have very different experiences.
What symptoms appear if lung cancer has spread?
When lung cancer spreads (metastasizes) beyond the lungs, it can cause symptoms in other parts of the body — and sometimes these are the first noticeable signs of the disease. Some patients learn they have lung cancer only after a bone fracture, a seizure, or another event sends them for tests.
- Bone pain — often in the back, hips, or ribs, and occasionally leading to a fracture.
- Headaches, dizziness, balance problems, weakness or numbness in an arm or leg, vision changes, or seizures — if cancer reaches the brain or nervous system.
- Yellowing of the skin or eyes (jaundice) — if cancer reaches the liver.
- Swollen lymph nodes — lumps felt in the neck or above the collarbone.
- Swelling of the face, neck, and arms — a less common sign (superior vena cava syndrome) that occurs when a tumor presses on a large vein in the chest, and that should be evaluated quickly.
Lung cancer can also produce so-called paraneoplastic syndromes, in which substances released by the tumor cause symptoms far from the lungs — for example, changes in blood chemistry, muscle weakness, or clubbing of the fingertips. These are uncommon, but they are another reason that unexplained, persistent symptoms deserve attention.
Are symptoms different in women – or in people with no smoking history?
The core symptoms are the same for everyone, but a few points are worth knowing. Lung cancer is now the leading cause of cancer death among women, and about one in five women diagnosed have never smoked. People who never smoked — as many as 20% of all those diagnosed in the U.S. — may be more likely to have their symptoms attributed to something else, simply because lung cancer is not the first thing anyone suspects. The lesson is the same regardless of sex or smoking history: a persistent, unexplained symptom should be checked, and not dismissed because someone ‘doesn’t fit the profile.’ For more, see our pages on women and lung cancer and on lung cancer in people with no smoking history.
When should you see a doctor?
See a health care provider if you have a cough that lasts more than two to three weeks, cough up any blood, have chest pain or shortness of breath that is new or getting worse, or have unexplained weight loss or fatigue. Do not wait for several symptoms to pile up — one that persists is enough reason to be evaluated.
Early evaluation genuinely matters. According to the American Cancer Society, the five-year relative survival rate is about 65% for localized non-small cell lung cancer that has not spread, compared with about 9% once it has reached distant parts of the body. Finding the disease earlier is one of the strongest factors in how treatable it is.
How to prepare for your appointment
- Write down your symptoms, when they started, and whether they are getting worse.
- Note your smoking history, including how much and for how long, and any exposure to radon, asbestos, or secondhand smoke.
- List any family history of lung cancer.
- Bring a list of your medications and any other health conditions.
- Ask directly whether your symptoms could be related to your lungs and whether you should be screened.
Who is at high risk, and should you be screened?
The U.S. Preventive Services Task Force recommends yearly screening with a low-dose CT scan for adults who meet all of the following: ages 50 to 80; a 20 pack-year smoking history; and currently smoke or have quit within the past 15 years. A pack-year is a way to measure lifetime smoking — one pack-year equals smoking an average of one pack a day for a year, so 20 pack-years could mean one pack a day for 20 years or two packs a day for 10 years. Screening can stop once a person has not smoked for 15 years, or develops a health problem that would prevent lung surgery.
If you think you may qualify, ask your doctor about a low-dose CT scan. It is the only screening test proven to lower the risk of dying from lung cancer, and the 2021 guidelines lowered the starting age and pack-year threshold specifically to reach more people earlier — including more women and Black Americans who were missed under the older criteria.
At the same time, people who have smoked are not the only ones who get lung cancer. As many as 20% of people diagnosed in the U.S. — an estimated 46,000 people each year — have never smoked. People who never smoked are not eligible for routine screening under current guidelines, which makes paying attention to persistent symptoms even more important for everyone.
How is lung cancer diagnosed after symptoms appear?
If symptoms or a screening scan raise concern, the next steps usually begin with imaging — a chest CT scan, and often a PET-CT scan to look at the rest of the body — followed by a biopsy, a small tissue sample examined under a microscope to confirm whether cancer is present and what type it is. If lung cancer is confirmed, that same tissue is tested for biomarkers: specific gene changes and proteins in the tumor. Biomarker testing is now a standard part of diagnosis, because it can determine whether targeted therapy or immunotherapy is an option and can shape the entire treatment plan. To learn what to expect, see biomarker testing and lung cancer treatment options.
Lung cancer symptoms FAQ
What is usually the first sign of lung cancer?
There is often no clear first sign, because early lung cancer frequently causes no symptoms. When early symptoms do appear, a persistent cough or getting short of breath more easily are among the most common. Any respiratory symptom lasting more than two to three weeks should be checked.
Can lung cancer be detected early?
Yes. A yearly low-dose CT scan can find lung cancer before symptoms start in people at high risk, when it is most treatable. Screening is recommended for adults 50–80 with a 20 pack-year smoking history who currently smoke or quit within the past 15 years.
How long can you have lung cancer without knowing?
It varies. Because the lungs have few nerve endings and early tumors rarely cause pain, a lung cancer can grow for months or longer before symptoms appear. This is why screening of high-risk people, rather than waiting for symptoms, is the best way to catch it early.
Is coughing up blood always lung cancer?
No. Coughing up blood has many causes, including infections and bronchitis. But it should always be evaluated by a doctor promptly, because it can be a sign of lung cancer.
Can you have lung cancer without coughing?
Yes. Some people have no cough at all and instead notice shortness of breath, chest pain, fatigue, weight loss, or symptoms from the cancer spreading, such as bone pain. Some have no symptoms until the disease is advanced.
Do non-smokers get lung cancer?
Yes. As many as 20% of people diagnosed with lung cancer in the U.S. have never smoked. Radon, secondhand smoke, air pollution, asbestos, and inherited gene changes can all contribute.
What do early lung cancer symptoms feel like?
Early symptoms are usually mild and easy to mistake for a cold, allergies, or being out of shape — a nagging cough, slight breathlessness, or a chest infection that lingers. The key warning sign is that they persist or change rather than improve.
Are lung cancer symptoms different in women?
The main symptoms are the same, but lung cancer is the leading cause of cancer death in women, and about one in five women diagnosed never smoked. Symptoms in non-smokers are sometimes attributed to other causes, so persistent symptoms should always be evaluated.
When should I worry about a cough?
Talk to a doctor about any cough that lasts more than two to three weeks, brings up blood, or comes with chest pain, shortness of breath, or unexplained weight loss.
Can a chest X-ray detect lung cancer?
A chest X-ray can sometimes show a lung tumor, but it is not sensitive enough to be used for screening. Low-dose CT is the recommended screening test because it can detect small, early cancers that an X-ray may miss.
Lung cancer research is changing what these symptoms mean. Earlier detection and better treatments are helping more people live longer after diagnosis. Your support funds the research behind that progress.
This page is for general education and is not a substitute for professional medical advice. Talk with your own health care team about your diagnosis, symptoms, and treatment options.
Sources
- American Cancer Society. Signs and Symptoms of Lung Cancer. cancer.org, 2025.
- American Cancer Society. Lung Cancer Survival Rates. cancer.org, 2026 (SEER, 2015–2021).
- American Cancer Society. Cancer Facts & Figures 2026. Atlanta: American Cancer Society, 2026.
- American Lung Association. Lung Cancer Symptoms and Diagnosis. lung.org, 2025.
- U.S. Preventive Services Task Force. Screening for Lung Cancer. JAMA, 2021 (A-50-80-20-15).
- Lung Cancer Research Foundation. Lung Cancer Fact Sheet. LCRF.org.