An autoimmune disease occurs when the immune system, which is designed to protect us from harmful organisms such as bacteria, viruses, and others, attacks the body's own cells, tissues, or organs.

Autoimmune illnesses can affect a single organ (such as the thyroid, pancreas, or skin) or multiple body systems at once (such as joints, muscles, blood, and organs). They are primarily chronic in nature and cannot always be completely addressed. In most situations, their symptoms can be managed with proper medical attention and care.