SymptomsBy Mayo Clinic Staff
Signs and symptoms of carbon monoxide poisoning may include:
- Dull headache
- Nausea or vomiting
- Shortness of breath
- 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.
Feb. 24, 2015
- Carbon monoxide questions and answers. U.S. Consumer Product Safety Commission. http://www.cpsc.gov/en/Safety-Education/Safety-Education-Centers/Carbon-Monoxide-Information-Center/Carbon-Monoxide-Questions-and-Answers-/. Accessed Oct. 23, 2014.
- AskMayoExpert. Hyperbaric oxygen therapy. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
- AskMayoExpert. Carbon monoxide toxicity. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
- Ferri FF. Ferri's Clinical Advisor 2015: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2015. https://www.clinicalkey.com. Accessed Oct. 23, 2014.
- Shannon MW, et al. Haddad and Winchester's Clinical Management of Poisoning and Drug Overdose. 4th ed. Philadelphia, Pa.: Saunders Elsevier; 2007. https://www.clinicalkey.com/#!/content/book/3-s2.0-B978072160693450092X. Accessed Oct. 23, 2014.
- Indications for hyperbaric oxygen therapy. Undersea & Hyperbaric Medical Society. http://membership.uhms.org/?page=Indications. Accessed Aug. 21, 2014.
- Auerbach PS. Wilderness Medicine. 6th ed. Philadelphia, Pa.: Elsevier Mosby; 2012.
- Millman MP (expert opinion). Mayo Clinic, Rochester, Minn. Nov. 23, 2014.