In short: Untreated ADHD in adults often shows up as job changes, money problems, relationship strain, accidents and chronic stress — not as obvious hyperactivity.
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Many adults with ADHD were never diagnosed. Here are common signs of untreated ADHD in adults, by life area.
At work
- Frequent job changes or boredom
- Missed deadlines despite long hours
- Struggling with admin but excelling in crises
With money
- Late payments and fines despite having funds
- Impulse spending
- Avoiding opening bills
In relationships
- Forgetting important dates
- Partners feeling unheard
- Emotional reactivity and rejection sensitivity
Health and safety
- More traffic incidents
- Irregular sleep and eating
- Higher rates of anxiety, depression and substance use
What to do
Take the free ADHD self-screen and read how to get assessed in SA.
More for adults: Adults hub · Free auDHD Check · Find a professional · Adults newsletter
Sources & further reading
- Barkley, Murphy & Fischer — ADHD in adults (CHADD summary)
- Faraone et al. (2021), The World Federation of ADHD International Consensus Statement, Neurosci Biobehav Rev
- NHS — ADHD in adults
Last checked: 31 October 2026. If you spot something out of date, tell us.