Which of the following is NOT a symptom of carbon monoxide (CO) poisoning?

Shortness of breath is typically associated with various respiratory conditions and can occur due to physical exertion or underlying lung diseases rather than being a direct symptom of carbon monoxide poisoning. In the context of CO poisoning, the other symptoms such as chest tightness, nausea, and headache are more commonly recognized as results of the body's reaction to carbon monoxide.

Carbon monoxide binds with hemoglobin more effectively than oxygen, leading to reduced oxygen supply to tissues. This can result in a lack of oxygenation, typically manifesting as headaches, dizziness, and even confusion. Patients may also experience nausea and chest tightness due to the body's distress from inadequate oxygen levels. While respiratory symptoms can appear in severe cases, shortness of breath is not a primary symptom associated with CO exposure. Understanding these differences helps clarify the physiological effects of carbon monoxide on the human body.