In medical terms, there is a condition named IgA nephropathy. IgA is actually a type of immunoglobulin. The function of immunoglobulins is to bind with antigens, which then induces an inflammatory response. For example, when bacteria enter the human body, the combination of IgA with the bacteria guides the body's immune system to target and attack the bacteria, which is a normal scenario. This IgA immunoglobulin acts as a mediator in the immune response. Due to some defect, this substance accumulates in the glomeruli. Its deposition in the glomerular capillaries can trigger inflammation in these blood vessels, leading to IgA nephropathy. This results in proliferation of glomerular mesangial cells, deposition in the mesangial matrix, causing blood and protein in the urine, and even leading to renal failure.