Addiction and mental health problems can occur at the same time. Someone may be dealing with depression while drinking heavily, using cocaine to cope with anxiety, or developing paranoia alongside regular cannabis use.
The two problems can affect each other. Alcohol or drugs may make existing symptoms worse, while anxiety, depression, trauma, or another mental health condition may lead someone to rely on substances as a way of coping.
This guide explains what dual diagnosis means, the conditions that can occur alongside addiction, common signs, how assessment works, and the treatment options available in the UK.
What Is Dual Diagnosis?
Dual diagnosis means having a substance use disorder and a mental health disorder at the same time. The substance may be alcohol or drugs, while the mental health condition could include depression, anxiety, bipolar disorder, PTSD, or psychosis. The two conditions can affect each other and may need to be treated together.
A person may develop a mental health problem before their substance use becomes problematic, or regular alcohol or drug use may worsen existing symptoms. Substance use can also cause symptoms such as anxiety, paranoia, low mood, or sleep problems, which can make it difficult to tell where one condition ends and the other begins.
A 2023 review of children and adolescents receiving mental health treatment found dual diagnosis rates ranging from 18.3% to 54%, with an average of 32.7% across the studies reviewed. Affective disorders were the most common psychiatric diagnoses reported, while boys had higher rates of dual diagnosis in the studies that examined sex differences.
Which Comes First: Substance Use or Mental Health Problems?
It can go either way. Someone may already have anxiety, depression, PTSD, or another mental health problem before they start misusing alcohol or drugs, while someone else may develop mental health symptoms after regular substance use. Some people also develop both problems around the same time.
Drugs and alcohol can make existing symptoms worse, while using them to cope with difficult feelings can lead to more frequent use. Withdrawal can also cause anxiety, low mood, poor sleep, and other symptoms, which can make it harder to tell what came first.
That’s why there isn’t always a simple answer. A proper assessment looks at the person’s mental health, substance use, and when their symptoms started.
Examples of Dual Diagnosis
Dual diagnosis can involve almost any combination of a substance use disorder and a mental health condition. These are some examples:
Alcohol Addiction and Depression
Alcohol can temporarily change mood, but regular heavy drinking can worsen low mood and sleep problems. Someone who already has depression may also use alcohol to cope with difficult emotions.
Cocaine Addiction and Anxiety
Cocaine can produce short-term confidence and energy, followed by a crash. Repeated use can be linked with anxiety, panic, agitation, and paranoia. Someone who already has an anxiety disorder may find these symptoms harder to manage while using cocaine.
Cannabis Addiction and Psychosis
Regular cannabis use is associated with an increased risk of psychotic symptoms, particularly with high-potency cannabis and frequent use. Psychosis can involve hallucinations, delusions, or a loss of contact with reality. Anyone experiencing these symptoms needs prompt professional assessment.
Opioid Addiction and PTSD
Someone living with PTSD may use opioids to numb distressing memories or emotions. Opioid dependence then creates its own problems, including cravings and withdrawal, which can make trauma symptoms harder to manage.
Alcohol Addiction and Bipolar Disorder
Alcohol use can interfere with mood stability and sleep. For someone with bipolar disorder, heavy drinking can make managing mood episodes more difficult and may interfere with prescribed treatment.
Substance Use and ADHD
ADHD affects attention, impulse control, and executive functioning. Some people with untreated ADHD use alcohol or drugs in an attempt to manage restlessness, concentration problems, or emotional difficulties. A proper assessment can distinguish ADHD symptoms from those caused by intoxication or withdrawal.
Common Signs of Dual Diagnosis
The signs can look different depending on the substance and mental health condition involved. A pattern that continues when the person is not intoxicated or experiencing withdrawal deserves professional assessment.
Here are seven signs that addiction may be occurring alongside a mental health problem.
1) Using Substances to Cope
Drinking or taking drugs becomes a way to deal with anxiety, sadness, trauma, stress, loneliness, or difficult memories. The person may feel unable to handle certain situations without using a substance first.
2) Mood Changes
Low mood, irritability, sudden emotional changes, or periods of unusually high energy may appear alongside increasing substance use. The timing matters, particularly if these symptoms continue when the person is sober.
3) Anxiety or Panic
Frequent anxiety, panic attacks, intense fear, or paranoia can occur with some drugs and during withdrawal. If these symptoms were present before substance use or continue during periods without drugs or alcohol, a mental health assessment may be needed.
4) Poor Sleep
Insomnia, sleeping for unusually long periods, waking repeatedly, or relying on alcohol or drugs to fall asleep can point to a wider problem. Sleep disruption can also make both mental health symptoms and cravings harder to manage.
5) Social Withdrawal
Someone may stop seeing friends, avoid family, lose interest in hobbies, or spend more time alone. Withdrawal can be linked to depression, anxiety, substance use, or a combination of the two.
6) Repeated Relapse
Returning to alcohol or drugs after treatment may happen when an underlying mental health problem remains untreated. For example, someone may become sober but return to drinking whenever severe anxiety or trauma symptoms become difficult to manage.
7) Problems With Daily Life
Work, education, finances, relationships, personal care, or housing may begin to suffer. When these problems occur alongside substance use and ongoing mental health symptoms, a combined assessment can help identify the right type of treatment.
How Is Dual Diagnosis Diagnosed?
There isn’t one test that confirms dual diagnosis. Assessment usually involves looking at the person’s substance use, mental health symptoms, physical health, medical history, and circumstances.
Mental Health Assessment
A clinician may ask about mood, anxiety, sleep, trauma, behaviour, thoughts, relationships, and previous mental health treatment. They may also ask when symptoms first appeared and whether they continue during periods without alcohol or drugs.
Substance Use Assessment
The assessment may cover which substances are being used, how much is taken, how often it is used, how it is taken, how long use has continued, and whether withdrawal symptoms occur. NHS England’s drug and alcohol treatment workforce framework recommends assessing the substance or substances involved, amount, pattern of use, route of administration, and severity of dependence.
Looking at Symptoms Over Time
Timing can help clinicians separate the effects of a substance from an underlying mental health condition. For example, paranoia during cocaine intoxication may not mean the person has a primary psychotic disorder. Persistent paranoia that continues after the effects have worn off requires a different assessment.
Physical Health Checks
Physical health also needs attention. Depending on the substance and symptoms, assessment may include blood tests, medication reviews, cardiovascular checks, liver function tests, or other investigations.
The aim is to build a clear picture of what is happening rather than treating one symptom in isolation.
How Is Dual Diagnosis Treated?
Treatment needs to address both the substance use problem and the mental health condition. The exact approach depends on the person’s symptoms, substance use, physical health, risks, and previous treatment.
Medically Supported Detox
Detox may be needed when stopping a substance carries a risk of significant withdrawal. Alcohol and benzodiazepine withdrawal can be medically serious, so stopping suddenly without medical advice is not recommended.
Detox deals with the physical effects of stopping the substance. It does not, on its own, treat the reasons behind addiction or an underlying mental health condition.
Residential Rehab
Residential rehab provides a structured setting where addiction treatment and mental health support can be delivered together. A programme may include medical care, counselling, group therapy, relapse prevention, psychiatric support, and family work, depending on the provider.
When comparing centres, ask whether the provider has experience with dual diagnosis and whether qualified mental health professionals are involved in treatment.
Outpatient Treatment
Outpatient treatment allows someone to live at home while attending appointments. This may include addiction counselling, mental health treatment, medication reviews, group support, and regular progress assessments.
It can work well when the person has a stable home environment and does not need round-the-clock care. The appropriate level of support should be decided through professional assessment.
Psychological Therapies
Therapy can address both substance use and the thoughts, behaviours, or experiences linked to mental health problems. Depending on the diagnosis, treatment may include Cognitive Behavioural Therapy (CBT), Motivational Interviewing, relapse prevention, family therapy, or trauma-focused treatment.
The therapy used should match the person’s condition. A treatment plan for someone with PTSD will not necessarily look the same as one for someone with depression, ADHD, or psychosis.
Medication for Mental Health Conditions
Medication may form part of treatment for conditions such as depression, bipolar disorder, ADHD, or psychosis. The choice depends on the diagnosis, symptoms, physical health, and other medicines or substances being used.
Medication should be prescribed and monitored by a qualified clinician. Anyone already taking prescribed medication should speak to their doctor before making changes.
Aftercare and Relapse Prevention
Treatment doesn’t stop when someone leaves rehab or finishes an initial programme. Aftercare can include counselling, recovery groups, mental health appointments, medication reviews, and follow-up with addiction services.
A good aftercare plan should also identify early warning signs and explain what to do if cravings, mental health symptoms, or substance use return.
Can Dual Diagnosis Be Treated Successfully?
Yes, dual diagnosis can be treated, but recovery doesn’t follow a fixed timetable. Treatment may need to continue after the initial rehab or detox programme, particularly when the mental health condition requires ongoing care.
The main focus is to treat the substance use problem and mental health condition together rather than leaving one untreated. NICE recommends coordinated care for people with co-existing severe mental illness and substance misuse, with services working together around the person’s needs.
The right treatment may involve residential rehab, community addiction services, NHS mental health services, private treatment, or a combination of these. If you think you or someone close to you may have dual diagnosis, a professional assessment is a sensible place to start.
How Anormed Can Help
Finding a rehab provider that understands both addiction and mental health can be difficult when you’re not sure what type of treatment is needed. A standard addiction programme may not have the mental health support required for someone with a co-occurring condition.
Anormed is an independent addiction treatment referral service that helps individuals and families explore suitable rehabilitation providers across the UK and Europe. Our advisors can discuss your circumstances, explain different treatment pathways, and help identify providers with experience in dual diagnosis.
If you’re looking for treatment for yourself or supporting a family member, you can speak with an Anormed advisor confidentially about the options available.
Frequently Asked Questions
Can addiction cause mental health problems?
Alcohol and drugs can worsen existing mental health symptoms and, in some cases, trigger psychiatric symptoms. The effect depends on the substance, amount used, frequency of use, and the person’s health. A professional assessment is needed to establish what is happening.
Can you have a mental health problem without knowing it?
Yes. Some conditions may go undiagnosed for years, particularly when symptoms are attributed to stress, substance use, personality, or everyday problems. An assessment can help identify symptoms that need further investigation.
Does dual diagnosis treatment include medication?
It can. Medication may be prescribed for certain mental health conditions when a clinician considers it appropriate. The treatment team should take current substance use and other medicines into account before prescribing or changing medication.
Can dual diagnosis be treated on the NHS?
Yes. NHS and community services provide treatment for mental health conditions and drug or alcohol problems, although the pathway depends on the person’s needs and local services. Some areas also have specialist dual diagnosis services or teams.
Is private dual diagnosis rehab available in the UK?
Yes. Some private rehabilitation providers offer programmes that combine addiction treatment with mental health support. The level of psychiatric care varies, so check what clinical staff are available and which conditions the centre treats before making a decision.