Zoology - Human Health and Diseases Question with Solution | TestHub

Disease means uneasiness. Diseases are classified as infectious or noninfectious. Infectious diseases are caused by pathogens and are thus communicable. Non infectious diseases are not caused by pathogens. These include diseases related to lifestyles, congenital diseases, diseases related to old age etc. Diseases related to lifestyle include diseases caused due to overuse of drugs, alcohol, lack of obesity etc. Pneumonia is caused by pathogen and hence it is an infectious disease.