Which of the following is NOT a symptom of caffeine withdrawal?

Caffeine withdrawal can manifest through a variety of symptoms that are linked to the abrupt cessation or reduction of caffeine intake. Common symptoms include fatigue, headaches, and nausea. Fatigue arises because caffeine is a central nervous system stimulant, and its withdrawal may leave individuals feeling more tired than usual. Headaches are also frequently reported due to changes in blood flow and the withdrawal effects on neurotransmitter levels. Nausea can occur as the body readjusts to the absence of caffeine, altering gastrointestinal function.

Hypersensitivity to light, while it can be experienced through other types of migraines or headaches, is not typically recognized as a common symptom within the context of caffeine withdrawal specifically. Instead, the other symptoms directly relate to physiological changes experienced when an individual stops consuming caffeine. Thus, hypersensitivity to light does not fit with the withdrawal symptom profile established in clinical observations of caffeine withdrawal.