Adult ADHD Symptoms & DSM-5 Criteria

What is Adult ADHD?

Attention Deficit Hyperactivity Disorder (ADHD) is a neurodevelopmental condition that affects both children and adults. In adults, ADHD often presents differently than in children, with symptoms typically showing up as difficulties in focus, organisation, emotional regulation, and impulse control. These symptoms can significantly impact home life, relationships, academic performance, and work.

Core Symptom Areas

Adult ADHD symptoms fall into three main categories:

  1. Inattention

Adults with attention difficulties may:

  • Struggle to focus or sustain attention
  • Make careless mistakes or overlook details
  • Appear not to listen, even when spoken to directly
  • Be easily distracted or forgetful in daily tasks
  • Fail to complete tasks, miss deadlines, or avoid mentally demanding work
  • Lose important items (keys, phones, paperwork)
  1. Hyperactivity and Impulsivity

In adults, hyperactivity is more often experienced as mental restlessness rather than physical movement. Adults may:

  • Feel constantly ‘on the go’
  • Fidget or have trouble sitting still
  • Interrupt others or blurt out answers
  • Struggle to wait their turn
  • Speak excessively or act impulsively
  • Make rash decisions, such as impulsive spending or quitting jobs suddenly
  1. Mood Instability (Not part of DSM-5, but commonly observed)

Adults with ADHD may also experience:

  • Rapid and unpredictable mood changes
  • Irritability, frustration, or low tolerance for delay
  • Emotional overreactions to minor stressors
  • Being described as “moody” or difficult to predict

DSM-5 Criteria for Adult ADHD

According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), a diagnosis of ADHD in adults requires:

  • At least 5 symptoms from either (or both) inattention and/or hyperactivity-impulsivity categories
  • Symptoms must be present for at least 6 months
  • Several symptoms should have been present before age 12, even if not diagnosed at that time
  • Symptoms must be inconsistent with developmental level and cause functional impairment in two or more settings (e.g., work, social life, home)
  • Symptoms must not be better explained by another mental health condition (e.g., anxiety, depression)
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