Mesothelioma and Asbestosis Two lung diseases are related to exposure to asbestos fibers: mesothelioma, and asbestosis. Mesothelioma is a cancerous condition, is caused by asbestos fibers. Asbestosis is a non-cancerous lung illness that causes scarring. Both diseases share similar symptoms, including breathlessness. Doctors diagnose mesothelioma through tests, which include biopsy. https://vimeo.com/705042101