Type III hypersensitivity
（重定向自Immune complex disease）
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![Immune Complex Glomerulonephritis, as seen in Henoch-Schönlein purpura; this is an example of IgA involvement in a nephropathy](/Images/godic/202502/09/Henoch-Schönlein_nephritis_IgA_immunostaining0233.jpg")
Type III hypersensitivity occurs when there is accumulation of immune complexes (antigen-antibody complexes) that have not been adequately cleared by innate immune cells, giving rise to an inflammatory response and attraction of leukocytes. Such reactions progressing to the point of disease produce immune complex diseases.