Frequently, several individuals may be exposed to CO from a common source. All exposed individuals should be examined even if they are asymptomatic. In an enclosed space poisoning can occur even with short exposure. Abnormal behavior in victims removed from automobiles should raise suspicion of CO poisoning.

Drugs and alcohol may also be present in self-inflicted exposure to CO.

Symptoms

• Headache
• Malaise
• Nausea/Vomiting
• Dizziness
• Difficulty walking
• Change in personality
• Reduced intellect
• Shortness of breath
• Rapid heart rate

CO poisoning may present with flu-like symptoms (without fever).