What are the classic symptoms of carbon monoxide poisoning?

The classic symptoms of carbon monoxide poisoning primarily include a headache, altered mental status, and cherry red lips. These symptoms stem from the binding of carbon monoxide to hemoglobin, which reduces oxygen transport in the bloodstream and affects various bodily functions.

Headache is often one of the earliest symptoms experienced by individuals exposed to carbon monoxide. As the exposure continues, individuals may experience altered mental status, which can range from confusion and lethargy to more severe neurological deficits. The presence of cherry red lips is particularly notable because it reflects the high levels of carboxyhemoglobin in the blood; the carbon monoxide binding to hemoglobin causes this distinct coloration.

In contrast, other options represent symptoms that can occur with different medical conditions. For example, fever, chills, and nausea are more indicative of infections or illnesses like influenza. Chest pain and dyspnea can suggest cardiovascular issues, and dizziness and syncope are often associated with various conditions such as hypotension or other neurological events. These presentations lack the specificity for carbon monoxide toxicity that is characteristic of the correct answer.