Final answer:
The provided text does not mention the cause of Pelvic Congestion Syndrome but instead focuses on pelvic inflammatory disease (PID) and other urinary system infections. Pelvic Congestion Syndrome is usually caused by incompetence of pelvic veins, not by the sexually transmitted infections that lead to PID.
Step-by-step explanation:
Cause of Pelvic Congestion Syndrome:
While the student's question specifically asks about the cause of Pelvic Congestion Syndrome, the provided text does not directly discuss it. Instead, the text outlines complications related to infections of the urinary system, such as pyelonephritis and kidney diseases, and briefly touches upon issues pertaining to pelvic inflammatory disease (PID) which is often caused by sexually transmitted infections like gonorrhea and chlamydia. PID can cause complications such as infertility, ectopic pregnancy, and can potentially lead to a serious blood infection known as sepsis. It is important to note that while Pelvic Congestion Syndrome shares the term 'pelvic', its causes differ from PID. Pelvic Congestion Syndrome is typically related to pelvic vein incompetence leading to varicosities in the pelvic region, which can cause chronic pain.