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These caffeine withdrawal symptoms are common: 1  Chills and/or hot spells. 2  Decreased alertness. 3  Depressed mood.  Difficulty concentrating or 1  thinking. Digestive issues (usually constipation, but sometimes also nausea and / or vomiting)  Fatigue, lethargy and / or sleepiness.
Withdrawal symptoms such as headaches can occur when stopping caffeine ingestion. Caffeine blocks brain receptors that can dilate the blood vessels. This may lead to some withdrawal symptoms, such as headaches. Teas, energy drinks, colas and chocolate contain caffeine, though in smaller doses. People who consume those products regularly may have withdrawal symptoms when they try to stop.