Immune system diseases
Immune System Diseases
Immune system diseases (pronunciation: ih-myoon sis-tem dih-zees) are a group of disorders where the body's immune system is either overactive or underactive. These diseases can be categorized into three main types: autoimmune diseases, immunodeficiency disorders, and hypersensitivity reactions.
Etymology
The term "immune system diseases" is derived from the Latin word "immunis", meaning "exempt", and the Greek word "systēma", meaning "whole compounded of several parts or members". The term "disease" comes from the Old French "desaise", meaning "lack, want; discomfort, distress; trouble, misfortune; disease, sickness".
Autoimmune Diseases
Autoimmune diseases occur when the immune system mistakenly attacks the body's own cells. Examples of autoimmune diseases include Rheumatoid arthritis, Type 1 diabetes, and Multiple sclerosis.
Immunodeficiency Disorders
Immunodeficiency disorders occur when the immune system is not able to defend the body against disease. This can be due to a lack of one or more of the immune system's components. Examples of immunodeficiency disorders include Primary immunodeficiency, such as Common variable immunodeficiency, and Secondary immunodeficiency, such as AIDS.
Hypersensitivity Reactions
Hypersensitivity reactions occur when the immune system overreacts to a harmless substance, such as pollen or dust. This overreaction can cause damage to the body's tissues. Examples of hypersensitivity reactions include Allergies and Asthma.
Related Terms
External links
- Medical encyclopedia article on Immune system diseases
- Wikipedia's article - Immune system diseases
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