Adult attention deficit hyperactivity disorder  

• Forgetful during daily activities
• Easily distracted by extraneous stimuli
• Losing important items (e.g. pencils, homework, toys, etc.)
• Always asking for attention, but
• Not listening and not responding to name being called out
• Unable to focus on tasks at hand, cannot sustain attention in activities
• Avoids or dislikes tasks requiring sustained mental effort
• Makes careless mistakes by failing to pay attention to details
• Difficulty organizing tasks and activities
• Fails to follow-through on complex instructions and tasks (e.g. homework, chores, etc.)

In children:

• Squirms and fidgets (with hands and/or feet)
• Cannot sit still
• Cannot play quietly or engage in leisurely activities
• Talks excessively
• Runs and climbs excessively
• Always on the go, as if "driven by a motor"
• Cannot wait for their turn
• Blurts out answers
• Intrudes on others and interrupts conversations

• Avoiding tasks or jobs that require concentration
• Procrastination
• Difficulty initiating tasks
• Difficulty organizing details required for a task
• Difficulty recalling details required for a task
• Difficulty multitasking
• Poor time management, losing track of time
• Indecision and doubt
• Hesitation of execution
• Difficulty persevering or completing and following through on tasks
• Delayed stop and transition of concentration from one task to another

In adults:

• Chooses highly active, stimulating jobs
• Avoids situations with low physical activity or sedentary work
• May choose to work long hours or two jobs
• Seeks constant activity
• Easily bored
• Impatient
• Intolerant and frustrated, easily irritated
• Impulsive, snap decisions and irresponsible behaviors
• Loses temper easily, angers quickly
• The tendency to hyperfocus on particularly stimulating or emotionally engaging tasks.