Which of the following describes a potentially serious symptom requiring immediate evaluation?

Rectal pain can be indicative of a variety of underlying conditions, some of which may require immediate medical attention. This symptom can be associated with serious issues such as infections, abscesses, or even gastrointestinal problems like diverticulitis or inflammatory bowel disease. Given the possible severity of these conditions, rectal pain should prompt prompt evaluation to rule out any serious pathology or complications.

In contrast, while scant nipple discharge, pelvic pain, and delayed ejaculation may warrant clinical attention, they are often not as acutely dangerous as rectal pain. Scant nipple discharge can result from hormonal imbalances or benign conditions, and pelvic pain could range from minor issues to more serious concerns but often allows for a somewhat less urgent evaluation depending on associated symptoms. Similarly, delayed ejaculation may arise from psychological or physiological factors that, while concerning for the patient, do not typically pose the same level of immediate threat to health as rectal pain can.