What are the symptoms of carbon monoxide poisoning?

Carbon monoxide (CO) is an odorless, colorless gas that can cause sudden illness and death if inhaled. The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as“flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you. People who are sleeping, drunk, or under the influence of other substances can die from CO poisoning before they have symptoms.

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