Mesothelioma is an aggressive form of cancer, usually found in the lungs. This type of cancer is widely known to be caused by exposure to asbestos, a natural fiber that was once used widely in construction projects and consumer goods. Asbestos was heavily used in the 1950’s – 1970’s, but is now prohibited in construction. Once asbestos is inhaled, it cannot be exhaled. It will sit in patients lungs and over time can cause complications. It could take 15 years or more for complications to develop, so if you think you have been exposed, do not wait to seek help.