In 1931, Dr. Otto Warburg won the Nobel Prize for proving cancer cells were generated by the anaerobic breakdown of glucose into fermentation, and the main property of cancer cells was low oxygen. He believed cancer should be interpreted as mitochondrial dysfunction (loss of the cells’ ability to generate energy). Dr. Warburg unknowingly predicted the root cause of cancer, because science has now identified pathogens that live inside the cells, consume sugar, cause fermentation, impair oxygen transport into the cell, consume energy inside the cell, and cause mitochondrial dysfunction. It is time for medical practitioners and researchers to diagnose these pathogens, before and after a cancer diagnosis.