A recent report released by the American Journal of Psychiatry has suggested that separate from each other, methamphetamine abuse and HIV infection can cause significant alterations in the size of certain brain structures, changes which are associated with impaired learning abilities and problem solving. However, when both methamphetamine abuse and HIV infection occur simultaneously, it can result in greater impairment than each condition alone. Find out more about this study, Methamphetamine Abuse, HIV Infection Cause Changes in Brain Structure.