What are the three key symptoms typically associated with ectopic pregnancy?

The three key symptoms associated with ectopic pregnancy are pain, amenorrhea, and vaginal bleeding.

Ectopic pregnancy occurs when a fertilized egg implants outside the uterus, most commonly in a fallopian tube. The presence of abdominal or pelvic pain is a hallmark symptom due to the stretching or rupture of the affected structure. Amenorrhea, or the absence of menstruation, often occurs because the pregnancy disrupts the normal menstrual cycle. Vaginal bleeding can result from the implantation of the ectopic pregnancy, leading to spotting or more significant bleeding as the ectopic tissue grows or if there is a rupture.

The other provided symptoms in the incorrect choices do not typically align with the hallmark presentation of ectopic pregnancy. While fever, abdominal swelling, and fatigue may present in various conditions, they are not specific indicators of an ectopic pregnancy. Similarly, nausea, vomiting, and diarrhea can occur in many different gastrointestinal or infectious processes and are not defining symptoms for ectopic pregnancy. Lastly, pelvic pain, headache, and increased urination are not characteristic symptoms for this condition, as the predominant symptoms are pain, amenorrhea, and vaginal bleeding.