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Caffeine withdrawal symptoms typically appear 12 to 24 hours after abstaining from coffee, and peak within 24 to 48 hours. They include: headache; lethargy and drowsiness; depressed mood; anxiety; nausea; vomiting; muscle pain and stiffness; and inability to concentrate.
Kuhar explained that caffeine blocks receptors in the brain that can dilate blood vessels causing headaches. Withdrawal symptoms can start from 12 to 20 hours after your last cup of coffee and peak about two days later and can last about as long as a week, Kuhar added.