Mental
health and substance use disorders are notable contributors to the
global total burden of disease. On a population level, co-occurring
mental health and substance use problems are estimated to account for
2–4%. In clinical samples, estimate is even higher. The aim of this
study was to examine changes in recognized mental health problems (MHPs)
and in the substance use profiles among clients with substance use
problems in Finland.

Data
concerning individuals with substance use entering Finnish social and
health care services during 1 day were collected nationwide at three
time-points in 2007, 2011, and 2015. Cross-tabulations and logistic
regression were used for statistical analysis.

Co-occurring
MHPs and substance use problems were common: 56–60% of the clients with
substance use problems were reported to have had MHPs between the years
2007 and 2015. The proportion of MHPs remained rather stable among
them. Substance use profiles have changed: the proportion of illicit
drug use among those who had MHPs has increased in health care services,
social services, and substance use problem services.

Co-occurring
substance use and MHPs among clients with substance use problems are
common, and substance use profile is shifting from using alcohol only
towards illicit drug use. This may even bring along more challenges for
the treatment system and should be considered in future service
planning.