Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of IgA Nephropathy ?
    ### Response:
    In its early stages, IgA nephropathy may have no symptoms; it can be silent for years or even decades. Once symptoms appear, the most common one is hematuria, or blood in the urine. Hematuria can be a sign of damaged glomeruli. Blood in the urine may appear during or soon after a cold, sore throat, or other respiratory infection.
    