What is the condition called when your body's immune system overreacts to an otherwise harmless foreign particle?

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An allergy is a condition in which the body's immune system reacts to a harmless foreign particle, such as pollen or certain foods, as if it were a dangerous invader. This can cause symptoms ranging from mild itching or sneezing to severe anaphylaxis, which can be life-threatening. Arthritis is a condition that affects joints and causes pain and stiffness, diabetes is a condition that affects blood sugar levels, and SCID (Severe Combined Immunodeficiency) is a rare genetic disorder that affects the immune system's ability to fight infections.

What Is the Condition Called When Your Body's Immune System