Dual Diagnosis or Co-occurring Disorders?
Understanding co-occurring mental health and substance use disorders
Understanding the Difference
Dual diagnosis and co-occurring disorders are quite similar terms, but they have a slight difference. A dual diagnosis means you have two or more mental health issues happening at the same time, like anxiety and depression. Co-occurring disorder, on the other hand, refers to having a specific substance addiction alongside a mental health disorder.
It can be tricky to tell the difference between the two because substance abuse often hides an underlying mental illness or vice versa. However, doctors and therapists have improved a lot and can often spot it early on.
Why specialist treatment matters
Adults and young people struggling with severe mental illness and substance abuse are some of the most vulnerable in our society because treating someone with co-occurring conditions needs special care.
So, if they want to overcome both the illness and addiction, they need a unique treatment programme that addresses both addiction and any co-occurring disorders.
Your councillor's view
As someone representing the Banbury Grimsbury & Castle electoral division, which faces considerable deprivation, my worries are especially important because we know that deprivation and low social capital often go hand in hand and can make it harder to manage co-occurring disorders.
The recent reports of early deaths indicate that, even with our best efforts, we are still not fully understanding this issue. I suspect that the shorter life expectancy of people with this combination of conditions might make it harder to accurately track and evaluate progress, and it could also limit the influence of real-life experiences on policy, service design and delivery.
Co-occurring disorders refers to having two disorders at the same time. Mental and substance use disorders (SUD) are often linked, especially in adolescents, those with severe mental illness and individuals with specific mental health conditions. When someone has both a mental health disorder and a substance use disorder (like recreational drugs, alcohol or prescription drugs), we call this a co-occurring disorder. The substance misuse might be due to addiction, or it might not.
Even though these conditions often happen together, it doesn't mean one causes the other, even if one seems to appear first. Figuring out which one started first can be tricky. Researchers think there are a few reasons why they are so often found together: genetics, stress, trauma, especially in childhood, and veterans with post-traumatic stress disorder (PTSD) are also more likely to develop SUDs.
Mental health issues can contribute to drug use and SUDs. For example, people with mental health problems might use drugs or alcohol to cope with temporary feelings of distress. Mental health disorders can also change the brain's structure, which can make addiction more likely. On the other hand, substance use and addiction can contribute to the development of a mental disorder or can change the brain's pathways, which can increase the risk of developing a mental disorder.
Three Key Concerns
Professional Bias
It seems that health professionals, who might be influenced by their own experiences and backgrounds, sometimes view patients with both depression and substance misuse less favourably than those with just one condition. This can affect the support options available to people with these co-occurring issues. Some professionals might find it less appealing to work with individuals who seem to be struggling with chronic dysregulation and a chaotic lifestyle.
Disconnected Services
Often, services are not well connected, and those working in areas like homelessness, housing or education might not be involved in the service design process. Perhaps restructuring the organisation could lead to a more flexible, matrix management system that helps break down these silos and improve service delivery. It is also less likely that we have genuine, collaborative processes where people can identify needs, design, implement and evaluate services together. Often, co-production is just about consultation or engagement, and it might involve organisations with their own goals, rather than people who have truly lived through these experiences.
Social Cohesion and Data
The impact on local social cohesion is quite noticeable, but it might not be fully understood. There is a need for more research and peer-reviewed studies to understand the effects of living close to individuals or groups with this type of comorbidity. We need reliable data and analysis to make our neighbourhoods better.
From what I understand, political district ward boundaries are used for gathering and keeping track of data. Instead we should use standardised geographical units like Output Areas, which have stable and comparable boundaries by grouping areas with similar population sizes. The main issue is that we don't have enough detail, and I think that using shifting political ward boundaries, which don't always match up with shifting electoral divisions, might unintentionally make things harder to understand. At first glance, politicians might think ward or divisional granularity is a good thing. But for politicians and policy makers to really get a grasp of trends and for monitoring and evaluation to be useful, we need to standardise how data is collected and make sure our enumeration areas are fixed for at least hyper-decadal scales. I'm not sure if this can be done in the current situation with Local Government Reform (LGR).
Question on Notice
I have raised a formal Question on Notice at Oxfordshire County Council about co-occurring disorder — asking what the pathway is for those affected, how they are supported throughout that pathway, and what is being done if no pathway exists.
Read the Question on NoticeImpacts on Individuals & Neighbourhoods
Impacts on Individuals
Worsened Health
Mental health symptoms and drug or alcohol addiction amplify each other, making medical and psychiatric treatments less effective.
Social Isolation
Individuals often withdraw from family and friends, struggle to keep jobs, and face severe relationship strain.
Housing and Financial Instability
High rates of poverty and homelessness plague this group as money goes toward sustaining addictions.
Higher Risk of Harm
There is a sharply elevated risk of self-injury, overdose, and suicide.
Impacts on Neighbourhoods
Strained Services
Separate mental health and addiction systems often fail to coordinate, leaving individuals bouncing between services without proper care.
Economic Costs
Neighbourhoods face heavy financial burdens through emergency room visits, repeated inpatient hospital stays, and homelessness services.
Community Cohesion, Public Safety and Justice
Increased contact with the criminal justice system and local law enforcement occurs when untreated conditions lead to crisis behaviours. Dysregulated behaviour can negatively impact on neighbours.
Family and Caregiver Strain
Families experience severe emotional stress, social isolation, and financial pressure while trying to support a loved one.