Mesothelioma is a form of cancer that is usually caused by exposure to asbestos and sometimes iron ore dust. After exposure it may take  from 20 to 40 years to show signs of having mesothelioma. 

Mesothelioma develops when malignant cells take over in the mesothelium which is a protective lining that covers your organs.

Many family members have contracted mesothelioma and have not been exposed to asbestos dust on job sites. How? Well, asbestos dust consists of very small asbestos particles and attaches itself to clothing. When a family member has worked in a workplace that has deadly cancer causing asbestos materials they bring home the asbsetos dust in clothing. Basically being a form of transportation for this deadly mesothelioma causing material.