Post-traumatic stress disorder and substance use disorders
Co-occurring PTSD and SUD worsen outcomes and complicate treatment.
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Post-traumatic stress disorder (PTSD) and substance use disorders (SUD) frequently co-occur, with 20–35% of individuals diagnosed with PTSD also meeting criteria for a SUD. This comorbidity is associated with poorer treatment outcomes, higher rates of hospitalization, and greater addiction severity compared to either disorder alone. Prevalence is elevated in specific populations, including combat veterans, women, Black and Hispanic communities, and members of the LGBTQ community.
Etiological theory
Several theories address the causal link between PTSD and SUD, though none has been definitively established, and they are not mutually exclusive. The susceptibility hypothesis proposes that substance use may increase the risk of developing PTSD after a traumatic event, as individuals who use substances may lack adequate coping mechanisms for extreme stress. Avoidant coping style has been identified as a third-party influence; those with this style attempt to avoid distressing thoughts, feelings, or physical sensations related to the stressor. Substance use can serve as a means to escape such distress, thereby increasing the likelihood of both PTSD and SUD.
PTSD affects substance use disorders
Individuals with comorbid PTSD and SUD tend to use substances more frequently and in greater amounts than those with SUD alone. PTSD symptoms can hinder abstinence from substance use, and those with both diagnoses are at increased risk for additional psychiatric conditions. The self-medication hypothesis, along with behavioral and emotional conditioning, plays a role: withdrawal symptoms such as increased heart rate and sweating can mimic fear responses, triggering trauma-related reactions. Chronic substance use as self-medication strengthens a conditioned link between PTSD symptoms and substance use, and stress-related norepinephrine release may further drive drug use, complicating treatment.
Implicated brain systems
The hippocampus, responsible for memory encoding, shows decreased volume in individuals with PTSD, SUD, or both, indicating interference with typical hippocampal functioning. The hypothalamic pituitary adrenal (HPA) axis activates the hormonal stress response via corticotropin-releasing hormone (CRH). Heightened CRH levels are observed during PTSD hyperarousal, drug seeking, withdrawal, and relapse, and are also linked to euphoria. Elevated CRH in PTSD may enhance the euphoric effects of substances, increasing addiction severity through positive reinforcement, and may drive continued substance use to avoid aversive withdrawal and hyperarousal sensations.
Treatment options
Assessment of treatment effectiveness for comorbid PTSD and SUD has yielded mixed results; many treatments have not proven more effective than treating either disorder alone, and high dropout and relapse rates complicate research. Two major treatment approaches exist: trauma-focused and non-trauma-focused. Non-trauma-focused treatments, such as Seeking Safety, aim to increase coping safety through cognitive behavioral therapy without emphasizing trauma memory exposure. Other non-trauma-focused options include CBT for PTSD in addiction programs, substance dependency post-traumatic stress disorder therapy, and holistic approaches like yoga, meditation, and acupuncture, which have shown effectiveness in victims of sexual assault and veterans.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Post-traumatic stress disorder and substance use disorders (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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