Adult-Onset ADHD: What to Know

Until recently, ADHD was considered a childhood-onset neurodevelopmental disorder that presented symptoms early in life. Research is expanding to better diagnose adult-onset ADHD, both as a continuation of childhood ADHD and as a condition that newly develops in adulthood.

Living with adult ADHD can be challenging, but with the right course of treatment, you can still live a productive and fulfilling life. Learn more here about the symptoms, research and treatment options for adult-onset ADHD.

What is adult-onset (late-onset) ADHD?

Adult-onset ADHD, or late-onset ADHD, is the diagnosis of attention deficient hyperactivity disorder (ADHD) in adulthood. The condition is often diagnosed in childhood, but as many as 90% of adults diagnosed with ADHD show no history of symptoms in childhood, based on recent studies.¹

Children diagnosed with ADHD can continue to experience symptoms into adulthood. It’s estimated that around 60% of children diagnosed with ADHD still exhibit symptoms as an adult.²

An estimated 8 million Americans, up to five percent of the population, have adult ADHD. Studies suggest that less than 20% of adults with ADHD are undiagnosed and unaware they have the condition. For those with adult ADHD diagnosis, only around one-fourth are currently getting treatment.³

What research has been done on adult-onset ADHD?

ADHD is generally considered a childhood-onset neurodevelopmental disorder and has been studied as such for many years. Adult-onset, or late-onset, ADHD is now being studied as a different condition. As more research is being done, beliefs are shifting around adult ADHD diagnosis and its relationship to childhood ADHD diagnosis.

For example, it was widely accepted that children diagnosed with ADHD could outgrow their symptoms into adulthood. Research shows that symptoms can last well into adulthood or not appear until adulthood. Studies are growing but remain limited when it comes to understanding adult-onset ADHD.⁴

What are the signs and symptoms of ADHD in adults?

Adult ADHD presents itself mainly in two forms: predominantly inattentive presentation and predominantly hyperactive-impulsive presentation. There are also some individuals that present a combination of both. Symptoms for the two forms of ADHD can differ.

How symptoms can differ between men and women

Adult ADHD symptoms can present differently in men and women. Men are diagnosed and referred for ADHD treatment more than women. Research suggests this could be because of the way ADHD symptoms present differently based on gender. Women more often show symptoms of predominantly inattentive presentation, while men are more likely to show symptoms of predominantly hyperactive-impulsive presentation.⁷

Effects of untreated ADHD

Untreated ADHD in adulthood can have serious consequences. Adults with untreated ADHD are more likely to have trouble maintaining employment and can struggle with:⁸

• Time management and getting to work on time.

• Meeting deadlines.

• Staying organized.

• Getting along with co-workers.

• Accepting criticism calmly.

Untreated adult ADHD can also negatively affect interpersonal relationships. Symptoms of ADHD make it difficult to control emotions and listen carefully. Adults with untreated ADHD are more likely to get divorced as well.⁹

Additional mental health issues can arise when adult ADHD is left untreated. Rates of substance abuse, risky sexual behavior, depression and low self-esteem are all prevalent in adults with untreated ADHD.¹⁰

It is important to seek treatment if you are experiencing symptoms of ADHD to avoid unintended and potentially harmful behavior from emerging or continuing.

How is adult ADHD diagnosed?

According to the American Psychiatric Association in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), adults should present at least five of the recognized symptoms to receive an ADHD diagnosis. Symptoms should also be severe enough to interfere with an individual’s life like negatively affecting work or relationships.¹¹

Getting tested for ADHD

If you suspect you might have ADHD, you can get tested for ADHD from an experienced professional. A licensed professional will ask questions about your symptoms, the impact on your life and your personal history to see if you meet the criteria for an adult ADHD diagnosis.¹²

How is adult ADHD treated?

Treatment options for adult ADHD include medication, education, counseling and skills training. A combination of treatments is often the most effective. There is no cure for adult ADHD, but symptoms can be managed for a better quality of life.¹³

ADHD Medication Types

There are two types of medication prescribed to treat adult ADHD: non-stimulant. Stimulant medications containing methylphenidate or amphetamine are the most prescribed. They boost and balance neurotransmitters in the brain. Most prescribed non-stimulant medications include atomoxetine and certain antidepressants such as bupropion. Non-stimulant options work slower than stimulants, but have fewer side effects.¹⁴

Stimulant vs. Non-stimulant Adult ADHD Medications

How RedBox Rx Can Help

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Benefits of RedBox Rx include:

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• $25 consultations with a U.S. licensed medical professional.

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Get started on your adult ADHD treatment journey with our online assessment.