自體免疫疾病是指當身體的免疫系統錯誤地攻擊自身組織時所引發的疾病。
正常情況下，免疫系統會保護我們免受細菌和病毒等有害入侵者的侵害。
然而，在自體免疫疾病中，免疫系統會將健康細胞視為敵人，導致炎症和損傷。常見的自體免疫疾病包括類風濕性關節炎、紅斑性狼瘡和多發性硬化症。這些疾病可能影響身體的不同部位，通常需要長期管理來控制症狀和防止併發症。

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Inflammation is a biological response of body’s immune system to injuries and  foreign organisms that enter the body.  Body's white blood cells quickly react to the damaged area and fix the problem. 

Autoimmune diseases occur when the body's immune system mistakenly attacks its own tissues. Normally, the immune system defends against harmful invaders like bacteria and viruses. However, in autoimmune conditions, it targets healthy cells, leading to inflammation and damage. Examples include psoriasis, rheumatoid arthritis, lupus, and multiple sclerosis. These diseases can affect various parts of the body and often require long-term management to control symptoms and prevent complications.