Is a branch of medicine dealing with mental disorders attributable to diseases of the nervous system. It encompasses both disciplines of psychiatry and neurology, although neurology and psychiatry are practiced separately (Yudofsky and Hales, 2002). Nevertheless, neuropsychiatry has become a growing subspecialty of psychiatry and it is also closely related to the field of behavioral neurology, which is a subspecialty of neurology that addresses clinical problems of cognition and/or behavior caused by brain injury or brain disease. "Behavioral Neurology & Neuropsychiatry" fellowships are jointly accredited through the United Council for Neurologic Subspecialties (UCNS), in a manner similar to how the specialties of psychiatry and neurology in the United States have a joint board for accreditation, the American Board of Psychiatry and Neurology (ABPN).
Examples of disorders classified as neuro-psychiatric illness is; unipolar depressive disorders, bipolar affective disorder, Schizophrenia, Epilepsy, Alcohol use disorders, Alzheimer and other dementias,   Parkinson disease, Multiple sclerosis, Drug use disorders,   Post-traumatic stress disorder,   Obsessive-compulsive disorder, Panic disorder,   Insomnia (primary), Migraine

How common is depression in the community?
With well-defined diagnostic categories and reliable operational criteria available, the frequency of depression can be measured in the community. High-risk population groups can be identified in the community and the effectiveness of various treatments and preventive measures determined.
Historically, disease burden has been based on mortality statistics. However, these statistics underestimate the burden from non-fatal conditions such as neuropsychiatric disorders. The World Health Organization has introduced a new concept of measuring suffering of populations based on time lived with disability which has been described as, Disability-Adjusted Life Year (DALY). According to World...