A patient presenting with pelvic pain, fever, and chills is most likely suffering from which condition?

The symptoms described—pelvic pain, fever, and chills—are most indicative of Pelvic Inflammatory Disease (PID). PID is an infection of the female reproductive organs that often arises from sexually transmitted infections (STIs) such as chlamydia or gonorrhea. The presence of systemic signs like fever and chills suggests a more severe infection, which aligns well with PID.

In comparison, while endometriosis can cause pelvic pain, it typically does not present with fever or chills unless there is a secondary infection or acute disease process involved. Ovarian cysts often result in pain but are usually not associated with fever unless there is a rupture or infection present. Urinary tract infections can lead to pelvic pain and fever but are more commonly associated with urinary symptoms such as dysuria or increased frequency.

Therefore, the combination of pelvic pain alongside fever and chills strongly points to PID as the most clinically relevant diagnosis in this context.