There are many ways to categorize diseases, but "nonfiction" isn't one of them.
Here are some common ways to categorize diseases:
By Cause:
* Infectious diseases: Caused by pathogens like bacteria, viruses, fungi, or parasites.
* Genetic diseases: Caused by mutations in genes.
* Autoimmune diseases: Occur when the body's immune system attacks its own tissues.
* Environmental diseases: Caused by exposure to harmful substances in the environment.
* Lifestyle diseases: Caused by unhealthy habits like smoking, poor diet, and lack of exercise.
By Body System:
* Cardiovascular diseases: Affecting the heart and blood vessels.
* Respiratory diseases: Affecting the lungs.
* Neurological diseases: Affecting the brain, spinal cord, and nerves.
* Gastrointestinal diseases: Affecting the digestive system.
* Musculoskeletal diseases: Affecting the muscles, bones, and joints.
By Severity:
* Acute diseases: Develop quickly and last a short time.
* Chronic diseases: Develop slowly and last a long time.
* Terminal diseases: Diseases that are ultimately fatal.
By Specific Disease Categories:
* Cancer: A broad category of diseases characterized by abnormal cell growth.
* Diabetes: A group of metabolic diseases characterized by high blood sugar levels.
* Mental illnesses: A wide range of conditions that affect mood, thinking, and behavior.
It's important to note that these categories are not mutually exclusive. A single disease can belong to multiple categories. For example, HIV/AIDS is an infectious disease, but it can also lead to a range of chronic conditions affecting different body systems.
If you have a specific type of disease in mind, let me know and I can provide more information about its categories.