Mesothelioma vs lung cancer describes two distinct cancers that can affect the chest but begin in different tissues. Mesothelioma usually starts in the thin lining around the lungs, while lung cancer begins in lung tissue. Their symptoms can overlap, so doctors use tissue testing to distinguish them and guide treatment.
Mesothelioma vs lung cancer: the key differences
Neither diagnosis is a better or worse version of the other. The important difference is where the cancer began, because that determines how doctors classify it and which treatments may be considered.
| Feature | Mesothelioma | Lung cancer |
|---|---|---|
| Where it begins | Usually in the pleura, the thin lining around the lungs. Less commonly, it starts in tissue around organs in the abdomen or other sites. | In the lung itself, often in the airways or the tissue that carries out gas exchange. |
| Main types | Types are classified by the appearance of the cancer cells, including epithelioid, sarcomatoid, and biphasic, which has features of both. | The main groups are non small cell lung cancer and small cell lung cancer. These are further divided by the cells and tissues involved. |
| Well established risk factors | Asbestos exposure is the main known risk factor. Disease can develop long after exposure. | Tobacco smoking is the leading risk factor. Radon, air pollution, workplace exposures including asbestos, and other factors can also raise risk. |
| How it is confirmed | Doctors examine a tissue sample, usually with tests that help identify mesothelioma cells. | Doctors examine tissue or cells from the lung or another affected site and identify the cancer type. |
| Treatment approach | May include chemotherapy, immunotherapy, radiation, or surgery for selected patients. The plan depends on cell type, extent of disease, and overall health. | May include surgery, radiation, chemotherapy, immunotherapy, or medicines aimed at particular changes in the cancer. The plan depends on type and extent of disease. |
Symptoms and risk factors can overlap
Both cancers may cause a persistent cough, shortness of breath, chest discomfort, fatigue, or weight loss. Mesothelioma around the lungs can also lead to fluid collecting between the lung and chest wall. These symptoms have many possible causes and cannot identify a cancer on their own.
Asbestos is a naturally occurring mineral once used in many building and industrial products. Breathing in asbestos fibers can increase the risk of mesothelioma and lung cancer. Smoking is a major lung cancer risk, but it is not considered a cause of mesothelioma. People with a history of asbestos exposure should tell their clinician, even if the exposure happened long ago.
Quick Facts
- Mesothelioma usually begins in the lining around the lungs, not in lung tissue.
- Lung cancer begins in the lung and includes several distinct types.
- Symptoms overlap, so a symptom list cannot establish which cancer is present.
- A tissue sample is generally needed to confirm the diagnosis.
How doctors diagnose each cancer
Evaluation often starts with a medical history, a physical examination, and imaging such as a chest X ray or CT scan. Imaging can show an abnormal area or fluid, but it usually cannot confirm the cancer type by itself.
Doctors typically need a biopsy, meaning a sample of tissue, to make a diagnosis. A pathologist examines the cells under a microscope and may use additional laboratory tests to determine where the cancer started. This distinction matters because mesothelioma and lung cancer can look similar on scans but require different treatment planning. Further scans may help show how far a confirmed cancer has spread.
Treatment depends on the exact diagnosis
There is no single treatment that suits everyone with either disease. The care team considers the cancer type, cell features, location, extent, symptoms, and the person's overall health and preferences. Some people receive one treatment, while others may have a combination.
For mesothelioma, care may involve chemotherapy, immunotherapy, radiation, or surgery in carefully selected situations. For lung cancer, options can include surgery, radiation, chemotherapy, immunotherapy, and targeted medicines when the cancer has a suitable molecular feature. A cancer specialist can explain likely benefits, risks, and alternatives. When deciding which diagnosis fits, tissue results and medical review matter far more than symptoms or exposure history alone.
Frequently Asked Questions
Is mesothelioma lung cancer?
No. Mesothelioma is a cancer that most often begins in the lining around the lungs. Lung cancer begins in the lung tissue itself.
What type of lung cancer is mesothelioma?
Mesothelioma is not a type of lung cancer. It is a separate cancer, usually arising in the pleura, the lining around the lungs.
Is mesothelioma and lung cancer the same?
No. They are different cancers with different starting tissues, though some symptoms and risk factors can overlap.
Can you have mesothelioma and lung cancer?
It is possible for a person to have both, although they are separate diagnoses. A medical team can determine this by examining tissue samples and other test results.