For example, you may notice difficulty walking up a flight of stairs or carrying groceries.
New or worsening breathlessness deserves medical evaluation.
Sudden severe breathlessness requires emergency attention.
Chest Pain
Some people with lung cancer experience chest discomfort.
The pain may be persistent, sharp, dull, or worse when coughing or taking a deep breath.
It can occur when a tumor affects the lining around the lungs, chest wall, or nearby structures.
However, chest pain has many possible causes, including heart disease, muscle strain, pneumonia, and blood clots.
Sudden chest pain, especially when accompanied by sweating, nausea, shortness of breath, or faintness, should be treated as an emergency.
Unexplained Weight Loss
Unintentional weight loss can occur in many chronic illnesses.
In cancer, changes in metabolism, inflammation, appetite, and energy use may contribute.
If your weight decreases without a deliberate change in diet or exercise, particularly over a relatively short period, arrange a medical assessment.
The concern is greater when weight loss occurs together with a persistent cough, fatigue, or chest symptoms.
Persistent Fatigue
Fatigue associated with illness may feel different from ordinary tiredness.
You may feel exhausted despite getting enough sleep.
Everyday activities may require more effort than before.
Lung cancer can contribute to fatigue through inflammation, reduced appetite, anemia, sleep disruption, and other effects.
However, fatigue is nonspecific and can also result from thyroid disorders, diabetes, depression, infections, and poor sleep.
The important factor is whether it persists without a clear explanation or occurs with other symptoms.
13. Less Familiar Symptoms of Lung Cancer
Some lung cancers can produce symptoms that appear far away from the lungs.
These effects may occur because cancer cells release substances that influence other organs, or because the tumor affects nearby nerves and blood vessels.
These are sometimes called paraneoplastic syndromes.
They do not occur in every patient, and they are not specific to lung cancer.
Changes in the Face and Neck
A tumor located near the upper part of the lung may sometimes affect nerves or blood vessels in the chest.
In particular, pressure on the sympathetic nerve pathway can produce a group of symptoms known as Horner syndrome.
These may include:
-
A drooping eyelid on one side.
-
A smaller pupil on the affected side.
-
Reduced sweating on one side of the face.
These changes require medical evaluation because several conditions can cause them.
A sudden onset of facial drooping, weakness, or speech difficulty should be treated as a possible stroke and requires emergency care.
Swelling of the Face, Neck, or Arms
A large tumor in the chest may sometimes compress the superior vena cava, a major vein that carries blood from the upper body back to the heart.
This can lead to superior vena cava syndrome.
Possible symptoms include:
-
Swelling of the face or neck.
-
Swelling of both arms.
-
Prominent veins across the chest.
-
Headaches.
-
Breathlessness.
-
A feeling of pressure in the head.
This condition requires urgent medical assessment.
Muscle Weakness and Neurological Changes
Some lung cancers are associated with immune or hormonal changes that affect muscles and nerves.
For example, small cell lung cancer can sometimes be associated with Lambert-Eaton myasthenic syndrome.
This condition may cause muscle weakness, particularly in the hips and legs.
Other symptoms can include dry mouth, reduced reflexes, and difficulty climbing stairs.
These neurological symptoms have many possible explanations and require specialist evaluation.
14. How Doctors Investigate Possible Lung Cancer
When a person has persistent respiratory symptoms or concerning examination findings, doctors may recommend several tests.
The exact investigation depends on the symptoms, medical history, and risk factors.
Physical Examination and Medical History
The process often begins with questions about:
-
Smoking history.
-
Occupational exposure.
-
Previous lung diseases.
-
Family history of cancer.
-
The duration of respiratory symptoms.
-
Changes in weight and appetite.
-
Finger or nail abnormalities.
The doctor may listen to the lungs, examine the fingers, check oxygen levels, and assess other parts of the body.
Chest X-Ray
A chest X-ray can help identify certain abnormalities, such as a large lung mass, pneumonia, fluid around the lungs, or other changes.
However, a normal chest X-ray does not reliably rule out early lung cancer.
Small tumors may not be visible, and some areas of the lungs can be difficult to assess.
If symptoms remain concerning, additional testing may be necessary.
CT Scan
A CT scan provides more detailed images of the lungs and surrounding structures.
It can identify smaller nodules and help doctors assess their size, shape, and location.
If a suspicious mass is found, further investigation may be recommended.
Not every lung nodule is cancerous.
Many are related to old infections, inflammation, or benign growths.
Doctors consider several factors, including the nodule's appearance, size, growth over time, and the patient's risk profile.
Bronchoscopy
Bronchoscopy uses a thin flexible tube with a camera to examine the airways.
It may allow doctors to identify abnormalities and collect tissue or fluid samples.
The procedure can be useful when a suspicious area is located near the larger airways.
Biopsy
A biopsy involves collecting tissue from a suspicious area for examination under a microscope.
Depending on the location, doctors may obtain a sample through bronchoscopy, a needle guided by imaging, or surgery.
The laboratory results help determine whether cancer is present and identify its type.
This information is essential for selecting appropriate treatment.
PET-CT
A PET-CT combines information about metabolic activity with detailed anatomical imaging.
It can help doctors assess whether a suspicious lung lesion or other area may contain active cancer cells.
It may also help determine whether the disease has spread.
However, inflammation and infection can also produce increased activity on a PET scan.
The findings must therefore be interpreted alongside other tests.
15. Who Should Consider Lung Cancer Screening?
Screening is different from diagnostic testing.
Screening is performed in people who do not have symptoms, with the goal of identifying disease before it becomes clinically obvious.
For certain people at high risk, low-dose computed tomography, or LDCT, has been shown to reduce the risk of dying from lung cancer.
Eligibility criteria vary between countries and medical organizations.
For example, some major guidelines recommend annual LDCT screening for adults aged 50 to 80 who have at least a 20 pack-year smoking history and currently smoke or quit within the past 15 years.
A pack-year is calculated by multiplying the number of cigarette packs smoked per day by the number of years a person smoked.
For example:
-
One pack per day for 20 years equals 20 pack-years.
-
Two packs per day for 10 years also equals 20 pack-years.
-
Half a pack per day for 40 years equals 20 pack-years.