When the Simplest Diagnosis Isn't the Safest: Sepsis Misread as Flu in the ED
A real-world example of Occams razor in action
Context
An urban emergency department was managing high patient volume during influenza season. Clinicians were encouraged to triage quickly to avoid ED crowding and keep throughput metrics healthy.
Situation
A 72-year-old woman with diabetes and mild cognitive impairment arrived with low-grade fever, malaise, and dizziness. Because her presentation matched the common pattern of seasonal influenza and she had no focal complaints, the treating physician documented 'likely viral illness' and discharged her with symptomatic care.
The bias in action
The physician applied Occam's Razor by choosing the simplest, most common explanation — influenza — without testing for alternative causes that required more assumptions (e.g., occult infection or sepsis). This mental shortcut reduced further diagnostic steps: no labs, no lactate, no blood cultures, and no safety-net instructions were given. Team members accepted the simple diagnosis because it fit the pattern they had seen repeatedly that day and because time pressure made the quieter, more complex possibilities feel improbable.
Outcome
Within 24 hours the patient returned worse and was admitted with frank sepsis requiring ICU care and vasopressors. Antibiotics were started later than recommended for suspected sepsis, complicating recovery. The patient survived but required a 12-day hospital stay and rehabilitation rather than the brief observation the team had expected.