Chronic glomerulonephritis is a kidney disorder caused by slow, cumulative damage and scarring of the glomeruli, or tiny blood filters in the kidneys, usually due to inflammation. This results in reduced kidney function over time and can ultimately lead to kidney failure if left untreated. The condition is diagnosed based on abnormal urine or blood tests and kidney imaging and confirmed via kidney biopsy. Treatment focuses on slowing disease progression with medications and managing symptoms like high blood pressure, while dialysis or kidney transplant may be needed in severe cases of kidney failure.