**SECTION Medical Education Blog

Waxing/waning confusion is most consistent with delirium physiology (toxic-metabolic/systemic/medication) rather than a focal intracranial lesion. 

Correctly clustering milestones (gross motor + language + fine motor) is the fastest way to answer board-style “what age is this infant?” questions. 

Severe dental pain after a root canal can represent an endodontic flare-up that often requires urgent dental intervention rather than “just more analgesics.” 

Key takeaway: Hydrofluoric acid burns can look deceptively mild but cause life-threatening hypocalcemia—classically producing QT prolongation on ECG.