Mesothelioma symptoms are often vague, mild, and easily mistaken for common illnesses — which is one reason the cancer is frequently diagnosed at a later stage. Symptoms usually do not appear until 20 to 50 years after asbestos exposure, when the disease has begun to affect the lining of the lungs or abdomen.

Symptoms of Pleural Mesothelioma (lungs)

The most common form of mesothelioma affects the lining of the lungs. Its symptoms include:

  • Shortness of breath (often the first noticeable sign), caused by fluid buildup around the lung (pleural effusion)
  • Chest pain or tightness
  • Persistent dry cough or a change in a chronic cough
  • Fatigue and unexplained weakness
  • Unexplained weight loss and loss of appetite
  • Low-grade fever or night sweats
  • Difficulty swallowing or hoarseness in some cases

Symptoms of Peritoneal Mesothelioma (abdomen)

When mesothelioma affects the lining of the abdomen, symptoms include:

  • Abdominal swelling, bloating, or pain (from fluid buildup, called ascites)
  • Changes in bowel habits
  • Nausea and loss of appetite
  • Unexplained weight loss
  • A feeling of fullness

Why Symptoms Are Easy to Miss

Because these symptoms overlap with pneumonia, bronchitis, IBS, and ordinary aging, mesothelioma is often not suspected early — especially if a doctor is unaware of a patient’s asbestos exposure history. This is why telling your physician about any past asbestos exposure is so important: it can prompt earlier, more targeted testing.

When to See a Doctor

Anyone with a known or suspected history of asbestos exposure who develops persistent shortness of breath, chest or abdominal pain, or unexplained weight loss should see a doctor and mention the asbestos exposure specifically. Earlier evaluation can lead to earlier diagnosis, which affects treatment options.

If you or a loved one was diagnosed with mesothelioma or another asbestos-related disease and were exposed to asbestos at work, in the military, or in a building, you may be entitled to compensation through asbestos trust funds and civil litigation.

This information is educational, drawn from sources such as the American Cancer Society and National Cancer Institute, and is not medical advice. Consult your own physician about symptoms and diagnosis.