The ACE Study, published in 1998, fundamentally changed our understanding of how childhood adversity affects adult health. Adverse Childhood Experiences — including abuse, neglect, and household dysfunction — have dose-dependent effects on lifetime risk for psychiatric conditions, substance use, cardiovascular disease, autoimmune disorders, and early mortality.
According to research summarized by the Centers for Disease Control and Prevention, roughly 60% of adults have at least one ACE, and roughly 1 in 6 has four or more. The implications for psychiatric care are substantial.
The Original ACE Categories
The original ACE Study identified 10 categories of childhood adversity (before age 18):
Abuse
- Physical abuse
- Sexual abuse
- Emotional abuse
Neglect
- Physical neglect
- Emotional neglect
Household dysfunction
- Domestic violence (witnessing)
- Parental substance abuse
- Parental mental illness
- Parental separation/divorce
- Incarcerated household member
Dose-Response Relationship
One of the study’s most important findings: ACE exposure has dose-dependent effects on adult outcomes. Higher ACE scores correlate with:
Mental health
- Depression (4-5x increased risk with ACE 4+)
- Anxiety disorders
- PTSD
- Substance use disorders
- Suicide attempts (12x increased risk with ACE 4+)
Physical health
- Cardiovascular disease
- Cancer
- Diabetes
- Autoimmune conditions
- Chronic lung disease
- Liver disease
Behavioral outcomes
- Early initiation of substance use
- Multiple sexual partners
- Smoking
- Risk for unintended pregnancy
- Lower academic and occupational achievement
Mortality
High ACE scores correlate with reduced life expectancy — by as much as 20 years for those with 6+ ACEs.
Mechanisms
Neurobiological
Early adversity affects brain development — particularly stress response systems (HPA axis), emotion regulation circuits, and reward systems. These changes can persist into adulthood.
Inflammation
Chronic early adversity produces persistent low-grade inflammation linked to physical and mental health outcomes.
Behavioral and coping
ACE exposure increases risk of behavioral patterns (substance use, smoking, eating patterns) that affect long-term health.
Relational
Attachment patterns from early adversity affect adult relationships, social support access, and help-seeking.
Epigenetic
Early experiences affect gene expression — and these changes may be partly transmitted to offspring.
Implications for Psychiatric Care
Screening matters
Knowing a patient’s ACE history changes treatment approach. Dr. Farkas screens for trauma history as part of comprehensive evaluation.
Trauma-informed approach
Care that recognizes trauma’s role — pacing, control, safety, predictability — produces better outcomes for patients with significant ACE history.
Treating consequences and causes
Adult depression, anxiety, or substance use in patients with high ACE scores often benefits from trauma-focused treatment alongside symptom-focused treatment.
Avoiding retraumatization
Trauma-informed care minimizes treatment elements that recapitulate adversity — avoiding power imbalances, surprises, or perceived violations.
Hope alongside recognition
ACEs are risk factors, not destinies. Many high-ACE adults achieve substantial healing with appropriate treatment.
Source: CDC ACE Study and follow-up research.
Healing Is Possible
High ACE scores increase risk — but don’t predict individual outcomes. Many adults with significant childhood adversity achieve:
- Substantial symptom reduction with treatment
- Healthy adult relationships
- Career success
- Strong physical health
- Sustained recovery from substance use
- Capacity for parenting that breaks intergenerational patterns
Trauma-informed treatment, supportive relationships, meaningful work, and addressing physical health all contribute to healing.
ACEs not assessed
Many adults receive psychiatric treatment without their trauma history being considered — missing how this affects symptom patterns and treatment needs.
Trauma-informed evaluation
Dr. Farkas considers ACE history as part of comprehensive evaluation — directing treatment that addresses both current symptoms and trauma history.
Healing the long arc
Properly addressed, the impact of ACEs can be substantially mitigated through evidence-based trauma-informed care.
Common Questions About ACEs
Should I take an ACE quiz?
Many people find it useful for self-understanding. The score itself isn’t a diagnosis — it’s a measure of risk exposure. Discussing with a trauma-informed clinician adds context.
Is high ACE score a death sentence for my health?
No. ACEs are risk factors. Many high-ACE adults have good outcomes with treatment, supportive relationships, and healthy lifestyle. Risk modification is real.
Will treatment help even decades later?
Yes. Adult treatment of trauma-related conditions produces substantial improvement at any age. See our related articles on childhood trauma and complex PTSD.
Should I tell my therapist about my childhood?
For trauma-informed care, yes. Sharing trauma history allows treatment to address what’s actually contributing to current symptoms.