This is a sub-category of All mental disorder deaths (see Map 8) and includes deaths from mental illness.

In Scotland and in Newcastle these disorders either occur more frequently, kill more people, are diagnosed or are suspected more often, or a combination of all these explanations play their part. Conversely mental disorder is rarely mentioned on the death certificates of those who end their days in and near Brighton, along the north bank of the Thames within London, in west and central Wales, or in Cheshire. At the ages at which these disorders are identified many other afflictions often affect those who die. The extent to which one or the other is more likely to be cited on a death certificate will reflect the medical cultural geography of each area as well as more direct biological mechanisms with environmental influences.

This category includes psychoses, delirium, depressive disorders not elsewhere classified, mental retardation, unspecified dementia and schizophrenia. These disorders reap mostly older people, with nearly 90% of deaths being of those aged 75 and over; 70% of those dying from this cause are females.