Which symptom is commonly associated with caffeine intoxication?

The symptom commonly associated with caffeine intoxication is a flushed face, which reflects the body's physiological response to increased caffeine levels. Caffeine stimulates the central nervous system, leading to enhanced alertness and an increase in heart rate, which can cause peripheral blood vessels to dilate. This vasodilation often manifests as a flushed or reddened complexion, indicating increased blood flow to the skin.

While extreme anxiety may be experienced by some individuals following caffeine consumption due to its stimulant effects, the flushed face is a more direct physical symptom tied to the immediate physiological changes caused by caffeine intake. Rapid weight gain is not typical of caffeine intoxication, as caffeine is known to be a thermogenic agent that may even promote weight loss in some contexts. Severe fatigue, which would typically suggest withdrawal or a lack of stimulants, does not align with intoxication, where energy and alertness are generally heightened instead.