Not due to any physical or other mental disorder, such as an Anxiety Disorder. However, People do die from it. As it is usually the case, lethal dosage varies from individual to individual according to weight. One exceptional case documents survival after ingesting 24 grams. The amount of caffeine in an average cup of coffee is 50 - 200 mg.
Infants metabolize caffeine very slowly.
Followed by nausea, vomiting, tachycardia, and confusion. Serious intoxication may cause delirium, seizures, supraventricular and ventricular tachyarrhythmias, hypokalemia, and hyperglycemia. For blood testing, cross-reaction with theophylline assays will detect toxic amounts. Studies on the side-effects of caffeine. A major study has found fewer suicides among drinkers of Caffeine than those who abstained from the popular stimulant.