Cancers and other forms of diseases are usually named according to the part of the body or the internal organ where abnormal growth of malignant cells takes place. In the case of Mesothelioma, the abnormal cells grow in the mesothelium, a surface cell layer that covers and protects most internal organs. Normally, the mesothelium produces small amount of fluid in order to lubricate its layersone of which directly covers the organ and allow the movement of the organs, like the expansion and contraction of the lungs. A Mesothelioma cancer patients mesothelium produces too much of this lubricating fluid, thereby damaging nearby tissues and organs. The most common form of Mesothelioma is Pleural Mesothelioma, which begins in the Pleural or Peritoneum, the membrane that lines the chest cavity and covers the lungs.