Yes, ADHD can be misdiagnosed as autism, and vice versa, because they are separate conditions with significant overlapping symptoms like social difficulties, focus issues, and emotional regulation challenges, making accurate diagnosis complex, especially as many people have traits of both (AuDHD). Key differentiators often lie in social motivation (ADHD impulsivity vs. autism social understanding) and attention patterns (ADHD's difficulty sustaining focus vs. autism's hyperfocus on interests).
Many people with one of the two diagnoses show elevated traits of both ADHD and autism. Common experiences for ADHD and autism include sensory differences, intense focus on specific interests, rejection sensitivity, executive dysfunction, sleep issues and emotional dysregulation.
ADHD and autism can present with overlapping symptoms, such as difficulties with attention, hyperactivity, and social interactions. As a result, ADHD can sometimes be misdiagnosed as autism. According to some studies, the misdiagnosis rate of ADHD as autism ranges from 10-20%.
People with ADHD may get distracted easily, forget instructions, or have a hard time finishing tasks. Attention problems in autism often occur for a different reason. A person with autism might be so focused on one thing—like a special interest or routine—that it's hard to pay attention to anything else.
Emotional dysregulation can be a feature of both ADHD (Attention Deficit Hyperactivity Disorder) and Autism Spectrum Disorder (ASD), but it manifests differently in each condition.
The ADHD "30% Rule" is a guideline suggesting that executive functions (like self-regulation, planning, and emotional control) in people with ADHD develop about 30% slower than in neurotypical individuals, meaning a 10-year-old might function more like a 7-year-old in these areas, requiring adjusted expectations for maturity, task management, and behavior. It's a tool for caregivers and adults with ADHD to set realistic goals, not a strict scientific law, helping to reduce frustration by matching demands to the person's actual developmental level (executive age) rather than just their chronological age.
But where Autism is marked by difficulties with neurotypical social interaction and communication plus a tendency to self-regulate through repetition and routine (i.e. special interests, stimming, need for specific rituals). ADHD is marked by difficulty regulating attention and with hyperactivity/impulsivity.
The 20-minute rule for ADHD is a productivity strategy to overcome task paralysis by committing to work on a task for just 20 minutes, leveraging the brain's need for dopamine and short bursts of focus, making it easier to start and build momentum, with the option to stop or continue after the timer goes off, and it's a variation of the Pomodoro Technique, adapted for ADHD's unique challenges like time blindness. It helps by reducing overwhelm, providing a clear starting point, and creating a dopamine-boosting win, even if you only work for that short period.
Around 90% of autism cases are attributed to genetic factors, meaning autism is highly heritable, with many different genes contributing, rather than a single cause, often interacting with environmental influences during early brain development, though specific environmental factors don't cause it but can increase risk. Twin studies show strong genetic links, with concordance rates between 60-90% in identical twins, and research points to complex interactions of many genes and prenatal/perinatal factors.
While characteristics differ they can be simultaneously present, so it is possible for kids to have not just one condition, but both. It is more common for people with Autism to have ADHD, rather than people with ADHD also experiencing Autism.
5 common problems that can mimic ADHD
The 10-3 rule for ADHD is a productivity strategy involving 10 minutes of focused work followed by a 3-minute break, designed to match the ADHD brain's need for short bursts of effort, making tasks less overwhelming and procrastination easier to manage by building momentum with quick, structured intervals. It helps individuals with ADHD ease into tasks, offering a tangible goal (10 mins) and an immediate reward (3 mins) to keep focus without burnout, often incorporating movement or preferred activities during breaks.
The "6-second rule" for autism is a communication strategy where a speaker pauses for about six seconds after asking a question or giving information, giving the autistic person extra time to process it without feeling rushed, which helps reduce anxiety and allows for a more thoughtful response, reducing frustration for both parties. Instead of repeating or rephrasing, which can be confusing, you wait, and if needed, repeat the exact same words after the pause.
The Unmasking Effect of ADHD Medication
ADHD medication can strip away the ADHD shield which may have been hiding Autistic traits. This often leads to a deeper exploration of neurodivergence, helping women identify and understand themselves more holistically.
For instance, a child with ADHD may struggle with social interactions due to impulsivity and inattentiveness, while a child with autism might have social difficulties stemming from challenges in understanding social cues and communication. However, the underlying reasons for these behaviours differ significantly.
Trouble managing emotions is a common ADHD symptom. Emotions can feel more intense with ADHD and can get in the way of everyday life. There are ways to help get control of and manage emotions.
Additionally, inherited genetic variations contribute greatly. Research shows that both mothers and fathers can carry autism-related gene variants. Some of these are common variants that increase the risk of autism, while others are rare mutations causing more severe effects.
While the exact reasons are not yet clear, changes in how the disorder is defined, increases in screening, and more awareness certainly contribute to this increase. If you have any concerns about your child's development, speak to a healthcare professional about diagnostic tests.
Often children show symptoms of autism within the first year of life. A small number of children with the condition appear to develop as expected in the first year. Then between 18 and 24 months of age, they may lose some skills and develop autism symptoms.
Increase stress relief by exercising outdoors—people with ADHD often benefit from sunshine and green surroundings. Try relaxing forms of exercise, such as mindful walking, yoga, or tai chi. In addition to relieving stress, they can teach you to better control your attention and impulses.
For adults, 7-8 hours is recommended. Try to avoid napping during the day. Optimise your sleep environment. Make sure your environment is quiet, calm and comfortable.
The ADHD burnout cycle is a pattern where constant effort to manage ADHD symptoms (like executive dysfunction, overstimulation, and masking) leads to extreme mental/physical exhaustion, a "crash," and a shame spiral, often followed by trying to overcompensate again, repeating the cycle. It involves phases like the initial push/overcompensation, the struggle/stress, the collapse/shutdown, and the guilt-ridden recovery attempt, resulting in fatigue, irritability, procrastination, and disengagement from life.
Autism and ADHD very often co-exist. Research suggests that 50 to 70% of autistic people also have ADHD (Hours et al., 2022), though figures vary between studies. Similarly, it is estimated that two-thirds of those with ADHD have at least one co-existing condition such as autism.
Attention deficit hyperactivity disorder (ADHD) and autism can look a lot like each other. Children with either condition can have problems focusing. They can be impulsive or have a hard time communicating. They may have trouble with schoolwork and with relationships.
Five key signs of autism (ASD) involve difficulties with social communication, repetitive behaviors, intense interests, sensory sensitivities, and strict routines, such as trouble with small talk/eye contact, hand-flapping/lining things up, deep focus on specific topics, sensitivity to sounds/lights, and distress over schedule changes, though these vary widely.