Urinary Tract Infection (UTI): This is often the most common cause of lower pelvic pressure and pain, especially in women. Symptoms such as dysuria, frequency, and urgency support this diagnosis.

Menstrual Cramps (Dysmenorrhea): For women, menstrual cramps are a common cause of lower pelvic pain and pressure, related to the menstrual cycle.
Ovarian Cysts: These can cause pelvic pain and pressure, especially if they rupture or twist.
Endometriosis: A condition where tissue similar to the lining inside the uterus grows outside of it, leading to pain and pressure.
Constipation: Can cause lower pelvic pressure and discomfort due to the buildup of stool in the rectum.

Ectopic Pregnancy: Although less common, an ectopic pregnancy is a life-threatening condition that must be ruled out, especially in women of childbearing age presenting with pelvic pain and pressure.
Appendicitis: While the pain typically starts near the navel and then moves, it can sometimes present as lower pelvic pain, especially if the appendix is located in a retrocecal position.
Diverticulitis: Inflammation of the diverticula in the digestive tract can cause severe pain and tenderness, usually in the lower left abdomen but can sometimes be felt as pelvic pressure.
Pelvic Inflammatory Disease (PID): An infection of the female reproductive organs that can cause severe pain and is a significant concern due to potential long-term consequences like infertility.

Ovarian Torsion: A rare but emergency condition where the ovary twists around its ligaments, cutting off blood supply.
Ureteral Stones: While more common in men, stones in the ureter can cause severe pain and pressure, often radiating from the flank to the groin.
Pelvic Congestion Syndrome: A condition characterized by chronic pelvic pain associated with ovarian varices, more common in women who have given birth multiple times.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic pelvic pain and pressure among other symptoms.