December 7, 2021

A disease or illness is a specific abnormal condition that negatively affects the structure or function of all or part of a living organism, and this is not due to any immediate external injury. Most diseases are medical conditions associated with specific symptoms and signs.


The disease can be caused by external factors or internal imbalances. Imbalances of the immune system can cause a variety of different diseases, including various forms of immunodeficiency, hypersensitivity, allergic reactions, and autoimmune disorders.


In many cases, terms such as "disease", "disorder" and "disorder" are used interchangeably, but there are specific cases that have specific preferred terms.


In humans, the word disease most often refers to any condition that causes pain, disorder, distress, social problems, or the death of the affected person. Diseases can be under more than one classification, such as an infectious disease such as tuberculosis and COVID-19, or a non-contagious disease such as asthma.

External Links

Disease - pictures, audio and video on Wikimedia Commons (English) Disease on the NCI Thesaurus website Disease on the NALT website Disease on the UMLS CUI website (English) Disease on MeSH disease on the BNCF website Disease on Disease ontology


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