Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Nephrotic Syndrome in Adults ?
    ### Response:
    Nephrotic syndrome can be caused by diseases that affect only the kidneys, such as focal segmental glomerulosclerosis (FSGS) or membranous nephropathy. Diseases that affect only the kidneys are called primary causes of nephrotic syndrome. The glomeruli are usually the targets of these diseases for reasons that are not fully understood.
    