The Three categories of disease are very different from one another. Communicable, Chronic and Degenerative and Hereditary and Genetic Disorders all have their own types of treatments and or cures and are all spread differently. Communicable diseases are diseases caused by pathogens that can be spread from one person or animal to another these diseases. These diseases are also called infectious diseases. The easiest way to prevent the spread of these diseases is to keep a clean environment and wash your hands. There are cures for many communicable diseases too. Hereditary and Genetic Disorders are not like the other types of diseases because u are predetermined at conception