Mesothelioma symptoms may not appear until the prognosis is bleak. Already a fatal form of lung cancer, mesothelioma symptoms are often mistaken for other conditions. In addition to having a lack of awareness, and thus a lack of real concern, mesothelioma symptoms are not recognized. There have been estimates made by health experts predicting mesothelioma could end up being the cause of half a million U.S. deaths and many people will continue to suffer mesothelioma symptoms unknowingly.