Which symptom is part of the classic triad of preeclampsia?

Hypertension is a key component of the classic triad of preeclampsia, alongside proteinuria and edema. Preeclampsia is a serious condition that typically occurs after the 20th week of pregnancy and is characterized by the onset of high blood pressure and the presence of protein in the urine after a period of normal blood pressure. The elevation in blood pressure is a significant marker and helps in identifying and managing the condition effectively. Monitoring blood pressure is vital during prenatal visits to detect preeclampsia early, in order to prevent further complications for both the mother and the fetus.

While palpitations, rash, and headaches can occur in various medical conditions, they do not define the hallmark features of preeclampsia. For instance, headaches can be a symptom of various issues but are not specific to preeclampsia without the presence of hypertension.