Signs and symptoms of carbon monoxide poisoning may include:

• Dull headache
• Weakness
• Dizziness
• Nausea or vomiting
• Shortness of breath
• Confusion
• Blurred vision
• Loss of consciousness

Carbon monoxide poisoning can be especially dangerous for people who are sleeping or intoxicated. People may have irreversible brain damage or even be killed before anyone realizes there’s a problem.

When to see a doctor

The warning signs of carbon monoxide poisoning can be subtle. But the condition is a life-threatening medical emergency. If you think you or someone you’re with may have carbon monoxide poisoning, get into fresh air and seek emergency medical care.