One of the most commonly asked questions when it comes to mesothelioma is what exactly is a mesothelium? The mesothelium is the main target of the mesothelioma cancer cells and it is a membrane within your body that protects your organs and ensures that they are safe and healthy.  This particular membrane protects areas such as the liver, the stomach, and the heart.  The mesothelium membrane keeps excess fluids from affecting your organs, but mesothelioma targets this membrane and causes extra liquid to get inside of your mesothelium. Excess fluids are extremely detrimental to your body, opening up the avenues for infections while also placing unnecessary pressure and pain on your organs. In addition, this extra fluid ends up turning into clumps of cancerous tissue and causes serious problems to your major organs. The lumps of cancer on your major organs can lead to the failure of these organs and can possibly lead to death.