Screening and Diagnosis
A caffeine addiction diagnosis is controversial, as most reports of this addiction are subjective and cannot be reliably confirmed by randomized clinical trials. The majority of the relevant literature contains case reports from individual examples of caffeine addiction.
No reliable blood or laboratory tests exist to help establish the diagnosis. Therefore, persons who feel they are having a problem with dependence or withdrawal should seek the care of a physician to confirm the diagnosis and to rule out other medical problems.