Carbon monoxide poisoning is often misattributed to which common illness, complicating early recognition?

• A. The flu
• B. Pneumonia
• C. Asthma
• D. Dehydration

Answer: (A)

Carbon monoxide poisoning typically shows up with nonspecific, flu-like symptoms—headache, dizziness, fatigue, nausea, and malaise. Because these feelings resemble what people experience with the flu, and sometimes there isn’t a fever, CO poisoning is easy to misattribute to influenza. That misidentification delays recognizing a poisonous gas exposure, which is dangerous since CO reduces oxygen delivery to tissues. In practice, if several people in the same environment feel suddenly unwell with these symptoms, especially near potential CO sources (furnaces, generators, enclosed garages), it’s important to think of CO and move to fresh air and seek emergency care. Pulse oximetry can be misleading in CO poisoning, so definitive testing for carboxyhemoglobin is used to confirm exposure.