Glomerulonephritis Glomerulonephritis is the inflammation of the glomerulus which is the network of capillaries inside the cup (Bowman’s capsule) of the kidney cells called nephrons. The glomerulus is responsible for filtering wastes from the blood, to form urine. Therefore, when it gets inflamed, the capillary vessel walls become more leaky. Glomerulonephritis can occur suddenly (acute)