Your ACE score is a number from 0 to 10 that reflects how many types of adverse childhood experiences you went through before age 18. Each category counts as one point, regardless of how many times it happened. Nearly two thirds of U.S. adults (63.9%) have at least one ACE, and about one in six (17.3%) have four or more, so a score above zero is far more common than a score of zero.
The 10 Categories
The ACE questionnaire comes from a landmark study conducted by the CDC and Kaiser Permanente. It asks about 10 specific types of childhood adversity, grouped into three areas: abuse, household challenges, and neglect. You get one point for each category that applies to your life before you turned 18.
Abuse:
- Emotional abuse: A parent or adult in your home regularly insulted you, put you down, or made you afraid you’d be physically hurt.
- Physical abuse: A parent or adult in your home hit, grabbed, or slapped you hard enough to leave marks or cause injury.
- Sexual abuse: An adult or someone at least five years older than you touched you sexually, made you touch them, or attempted intercourse.
Household challenges:
- Domestic violence: Your mother or stepmother was physically harmed or threatened by a partner.
- Substance abuse in the home: A household member was an alcoholic, problem drinker, or used drugs.
- Mental illness in the home: A household member was depressed, mentally ill, or attempted suicide.
- Parental separation or divorce.
- Incarcerated household member: Someone in your household went to prison.
Neglect:
- Emotional neglect: You rarely felt loved, supported, or important to your family.
- Physical neglect: You didn’t have enough to eat, wore dirty clothes, or had no one to protect you or take you to the doctor.
What a Higher Score Means for Health
ACE scores follow what researchers call a dose-response pattern: the higher the number, the greater the statistical risk for a range of health problems later in life. This doesn’t mean a high score guarantees illness. It means the odds shift.
People with four or more ACEs have roughly 1.4 times the risk of developing diabetes and 1.2 times the risk of cancer compared to people with zero ACEs. The risk of heart attack climbs to about 1.4 times higher. Depression shows the strongest link, with risk increasing up to five times. Adults with any history of ACEs are 4.3 times more likely to develop a substance use disorder. For women specifically, the likelihood of an alcohol use disorder is nearly six times higher.
At the extreme end, people with six or more ACEs died nearly 20 years earlier on average than those with none, according to a follow-up analysis of the original study population. Those with six or more ACEs had an average age of death around 60.6 years, compared to 79.1 years for those with zero.
How Childhood Stress Affects the Body
The connection between childhood trauma and adult disease isn’t just behavioral. Repeated or prolonged stress in childhood changes how the body’s stress response system develops. When a child faces constant threats, the system that releases stress hormones stays activated far longer than it should. Over time, this sustained activation wears down the body, a process scientists call allostatic load.
This chronic stress response affects brain regions involved in fear, memory, and decision-making. The part of the brain that sounds the alarm during danger can become overactive, while the parts responsible for calming that alarm don’t develop as strongly. The result is a nervous system that stays on high alert well into adulthood, contributing to inflammation, immune dysfunction, and the chronic diseases linked to high ACE scores.
What the Score Doesn’t Capture
The ACE score is a useful population-level tool, but it has real limitations as a measure of individual risk. Someone with a score of 1 who endured years of severe, unrelenting abuse carries a very different biological burden than someone with a score of 3 who experienced milder or more intermittent exposure to multiple categories. The questionnaire counts types of adversity, not their severity, frequency, or duration.
The original 10 categories also leave out experiences that can be equally damaging. Researchers have since proposed expanded categories that include witnessing community violence, experiencing racism, being bullied, living in an unsafe neighborhood, and spending time in foster care. These community-level adversities disproportionately affect children of color and those in under-resourced areas, meaning the original questionnaire can undercount adversity for entire populations.
Because of these gaps, the ACE score is not a diagnostic tool and isn’t suitable for clinical decision-making the way a blood pressure reading or cholesterol level would be. It’s a conversation starter, not a verdict.
Protective Factors That Change the Equation
A high ACE score is not a life sentence. Research on positive childhood experiences (PCEs) shows that certain protective factors can buffer the effects of adversity. Five domains consistently predict better adult health outcomes: a healthy school climate with supportive peer relationships, neighborhood safety, neighborhood support, a nurturing relationship with a father figure, and a nurturing relationship with a mother figure.
Of these, two remain protective even after accounting for ACE exposure: supportive peers and a healthy school environment, and living in a safe neighborhood. This matters because it means the damage from adversity isn’t locked in. Positive experiences in even one or two of these areas can shift the trajectory.
Moving Forward After a High Score
If you’ve taken the questionnaire and your number is higher than you expected, knowing your score gives you context for patterns you may already recognize in your health or behavior. Trauma-informed therapy, which is built around safety, trust, collaboration, and empowerment, is specifically designed to address the lasting effects of childhood adversity. These approaches focus on helping people understand how early experiences shaped their stress responses and building new patterns rather than simply treating symptoms.
Stable relationships, regular physical activity, and consistent sleep all help regulate a stress response system that was shaped by early adversity. The brain remains capable of forming new connections throughout life, which means the heightened stress activation from childhood can be gradually dialed down with the right support and environment.