Below is an instruction from Human. Write a response.
    ### Instruction:
    How many people are affected by IgA Nephropathy ?
    ### Response:
    IgA nephropathy is one of the most common kidney diseases, other than those caused by diabetes or high blood pressure.1
                
IgA nephropathy can occur at any age, although the first evidence of kidney disease most frequently appears when people are in their teens to late 30s.
    