Dual Diagnosis is extremely common in drug addiction. Many chronic drug abusers–the individuals we commonly regard as addicts–often simultaneously suffer from a serious mental disorder. In 2002 an estimated 4.0 million adults met the criteria for both serious mental illness and substance dependence or abuse in the past year. Drug treatment and medical professionals call this condition a co-occurring disorder or a dual diagnosis. Chronic drug abuse may occur in conjunction with any mental illness identified in the American Psychiatric Association Manual (DSM-IV). Some common serious mental disorders associated with chronic drug abuse include schizophrenia, bipolar disorder, manic depression, attention deficit hyperactivity disorder (ADHD), generalized anxiety disorder, obsessive-compulsive disorder, post-traumatic stress disorder, panic disorder, and antisocial personality disorder. Some of these disorders carry with them an increased risk of drug abuse (see table below).