Depression and Addiction

Depression and addiction are routinely seen together as it is a common side-effect of drug or alcohol use. Drug or alcohol use can also make pre-existing depression worse.

Depression and substance use disorders commonly occur together – a relationship that can profoundly affect a person’s emotional wellbeing, behaviour, and everyday functioning. Substance use can contribute to the emergence or worsening of depressive symptoms, and pre‑existing depression can increase the risk of developing a problematic pattern of alcohol or drug use.

What Is Depression?

Feeling sad or having a difficult day occasionally is a normal part of life. However, clinical depression is a serious mental health condition that affects mood, thoughts, energy, and behaviour, often making everyday activities feel overwhelming or unmanageable.

Symptoms of depression can include:

• Persistent low mood or emptiness
• Loss of interest in activities once enjoyed
• Changes in appetite or sleep patterns
• Difficulty concentrating or making decisions
• Withdrawal from social interactions
• Fatigue or loss of energy
• Recurrent negative thoughts (e.g., “I’m a failure,” “Life has no purpose”)

For a diagnosis of clinical depression, these symptoms typically persist for at least two weeks and significantly impact daily functioning. If untreated, depressive episodes can last months or even years.

How Depression and Addiction Are Connected

The co‑occurrence of depression and addiction is common and deeply intertwined. Australian data indicates that people living with a mental health condition are significantly more likely to engage in risky substance use than those without.

People with depressive symptoms may use drugs or alcohol to try to alleviate distressing emotions. While substances may provide temporary relief, they do not resolve underlying depression and often worsen symptoms over time. Two main patterns are frequently observed:

Substance Use Triggers or Worsens Depression

Prolonged or heavy use of alcohol and drugs can lead to chemical changes in the brain that contribute to depressive symptoms. These can include lethargy, sadness, guilt, and loss of interest in daily activities. If dependence develops, particularly during periods of withdrawal, symptoms of depression can intensify. Without professional support, attempts to stop using substances often increase feelings of hopelessness and despair.

Depression Can Lead to Problematic Substance Use

Individuals experiencing depression may turn to alcohol or drugs as a form of self‑medication, seeking temporary relief from emotional pain or overwhelming thoughts. Early in this pattern, substances may seem to reduce distress, but over time tolerance increases, meaning more of the substance is needed to achieve the same effect. This increased use can accelerate the development of dependency and worsen both depression and substance use outcomes.

Why Treating Both Together Matters

When depression and addiction coexist, this is referred to as dual diagnosis or co‑occurring disorders. Effective treatment must address both conditions simultaneously because:

• Treating only one disorder increases the likelihood of relapse in the other.
• Substance use can mask or mimic symptoms of depressive disorders, complicating diagnosis if stabilisation hasn’t occurred.
• A holistic approach supports recovery across mental, physical, emotional, and social domains.

An integrated addiction treatment program typically includes psychological therapy, counselling, medical support, relapse prevention strategies, and ongoing care to build coping skills and resilience.

By treating depression and addiction together, individuals have a stronger foundation for long‑term recovery, reduced risk of relapse, and improved quality of life.

Immediate Support

If you or someone you know is thinking about suicide or experiencing acute distress, please seek immediate help:

• Lifeline: 13 11 14
• MensLine Australia: 1300 789 978
• Suicide Call Back Service: 1300 659 467

References

1. Australian Bureau of Statistics (ABS). National Study of Mental Health and Wellbeing, 2020–2022. Canberra: ABS; 2023. Available from: https://www.abs.gov.au/statistics/health/mental-health/national-study-mental-health-and-wellbeing/latest-release
2. Australian Institute of Health and Welfare (AIHW). Mental health and substance use: co‑occurrence and links to substance use behaviours. Canberra: AIHW; 2023. Available from: https://www.aihw.gov.au/mental-health/topic-areas/health-wellbeing/mental-illness-and-substance-use
3. Australian Institute of Health and Welfare (AIHW). National Drug Strategy Household Survey 2022–23: Summary of findings. Canberra: AIHW; 2023. Available from: https://www.aihw.gov.au/reports/alcohol/national-drug-strategy-household-survey-2022-23/summary