Disease - Wikipedia There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases, and physiological diseases Diseases can also be classified in other ways, such as communicable versus non-communicable diseases
Conditions A to Z - NHS Find out about health conditions, including their symptoms and how they're treated
Diseases and Conditions - Mayo Clinic Alphabetical guide of diseases and conditions from Mayo Clinic experts Click on disease or condition by first letter for more information