Due to the vagueness of most signs and symptoms associated with carbon monoxide poisoning—nausea, vomiting, headache, fatigue, chest pain—other diagnoses are regularly suspected. A high concentration of carbon monoxide at a patient’s home will suggest the possibility of carbon monoxide poisoning, but other causes still have to be ruled out.
The list of differential diagnoses is too broad to identify. Each case is different and should be evaluated based on the patient’s presentation, history, and tests.