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  2. Disease - Wikipedia

    en.wikipedia.org/wiki/Disease

    Disease. A disease is a particular abnormal condition that adversely affects the structure or function of all or part of an organism and is not immediately due to any external injury. [1][2] Diseases are often known to be medical conditions that are associated with specific signs and symptoms.

  3. Autoimmune disease - Wikipedia

    en.wikipedia.org/wiki/Autoimmune_disease

    An autoimmune disease is a condition that results from an anomalous response of the adaptive immune system, wherein it mistakenly targets and attacks healthy, functioning parts of the body as if they were foreign organisms. [1] It is estimated that there are more than 80 recognized autoimmune diseases, with recent scientific evidence suggesting ...

  4. Infection - Wikipedia

    en.wikipedia.org/wiki/Infection

    An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection. Infections can be caused by a wide range of pathogens , most prominently bacteria and viruses . [ 2 ]

  5. Epidemic - Wikipedia

    en.wikipedia.org/wiki/Epidemic

    Example of an epidemic showing the number of new infections over time. An epidemic (from Greek ἐπί epi "upon or above" and δῆμος demos "people") is the rapid spread of disease to a large number of hosts in a given population within a short period of time. For example, in meningococcal infections, an attack rate in excess of 15 cases ...

  6. Lifestyle disease - Wikipedia

    en.wikipedia.org/wiki/Lifestyle_disease

    Lifestyle diseases can be defined as the diseases linked to the manner in which a person lives their life. These diseases are non-communicable, and can be caused by lack of physical activity, unhealthy eating, alcohol, substance use disorders and smoking tobacco, which can lead to heart disease, stroke, obesity, type II diabetes and lung cancer ...

  7. Chronic condition - Wikipedia

    en.wikipedia.org/wiki/Chronic_condition

    A chronic condition (also known as chronic disease or chronic illness) is a health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time. The term chronic is often applied when the course of the disease lasts for more than three months. Common chronic diseases include diabetes ...

  8. Viral disease - Wikipedia

    en.wikipedia.org/wiki/Viral_disease

    A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples are the common cold , gastroenteritis and pneumonia .

  9. Zoonosis - Wikipedia

    en.wikipedia.org/wiki/Zoonosis

    Zoonosis. A zoonosis (/ zoʊˈɒnəsɪs, ˌzoʊəˈnoʊsɪs / ⓘ; [1] plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite, or prion) that can jump from a non-human (usually a vertebrate) to a human and vice versa. [1][2][3] Major modern diseases ...