Which of the following symptoms indicates a potential complication during the postpartum period?

A persistent severe headache during the postpartum period can signify a potential complication, such as postpartum preeclampsia or other cerebrovascular issues. This type of headache is concerning if it is severe, continuous, or accompanied by other symptoms such as visual disturbances or high blood pressure, as these may indicate a need for immediate medical evaluation.

Normal uterine involution is a healthy process reflecting the uterus returning to its pre-pregnancy size and does not suggest a complication. Minor vaginal bleeding is typically expected after delivery, as long as it remains manageable and is not accompanied by other concerning signs. Decreased appetite can occur in the postpartum period due to various factors, including fatigue and hormonal changes, and is generally not viewed as a definitive symptom of a complication. Thus, recognizing the significance of a persistent severe headache is crucial for monitoring postpartum health and ensuring timely intervention if necessary.