Final answer:
Increased downward pressure on the presenting part during pregnancy can cause symptoms such as frequent urination, intestinal blockage, circulatory problems, and discomfort in the pelvic area.
Step-by-step explanation:
With increased downward pressure on the presenting part (lightening), a woman may experience several symptoms during pregnancy. These symptoms can include frequent urination, as the pressure on the bladder increases. There may also be intestinal blockage and circulatory problems, particularly in the legs, which can lead to the formation of blood clots. Additionally, the woman may notice discomfort and pressure in the pelvic area.