autoimmunity

n. self-immunization, production of antibodies within the body

Autoimmunity is the failure of an organism to recognize its own constituent parts (down to the sub-molecular levels) as "self", which results in an immune response against its own cells and tissues. Any disease that results from such an aberrant immune response is termed an autoimmune disease. Prominent examples include Coeliac disease, diabetes mellitus type 1 (IDDM), systemic lupus erythematosus (SLE), Sjögren's syndrome,  multiple sclerosis (MS), Hashimoto's thyroiditis, Graves' disease, idiopathic thrombocytopenic purpura, and rheumatoid arthritis (RA). See List of autoimmune diseases.
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Autoimmunity /au·to·im·mu·ni·ty/ a condition characterized by a specific humoral or cell-mediated immune response against the constituents of the [more]Autoimmunity - Community and Resources

Noun
1. production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions
(hypernym) pathology
(part-holonym) autoimmune disease, autoimmune disorder

noun
state where an organism produces autoantibodies to attack its own cells