Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Loin pain hematuria syndrome ?
    ### Response:
    What causes loin pain hematuria syndrome? The exact underlying cause of loin pain hematuria syndrome (LPHS) is currently unknown. However, scientists have proposed several theories. For example, some cases of LPHS may be due to abnormal glomerular basement membranes, which are the tissues in the kidney that filter blood.
    