Mesothelioma symptoms are not specific to the disease;

Shortness of breath and pain in the chest due to an accumulation of fluid, these symptoms may be caused by mesothelioma or by other, less serious conditions. It is important to see a doctor about any of these symptoms.

Mesothelioma Symptoms | Signs of Asbestos Cancer
Mesothelioma symptoms may not appear until 20 years or more after exposure. Asbestos symptoms are linked with respiratory malfunction and sometimes common illnesses. The type of mesothelioma - whether pleural, peritoneal, or pericardial - also determines what the symptoms might be.

Mesothelioma Symptoms - Malignant Mesothelioma
Mesothelioma is an asbestos-related cancer. Mesothelioma symptoms are not specific to the disease; that is, many mesothelioma symptoms are also symptoms of other medical problems. A less common but still prevalent symptom of pleural mesothelioma is weight loss. Some patients show virtually no symptoms. One of the most common and specific symptoms of pleural mesothelioma is the accumulation of fluid between the lungs and chest cavity. This generally causes shortness of breath.