Riordan Wiki
That's your battlefield reflexes. In a real fight, they'd keep you alive. As for the attention problems, that's because you see too much, Percy, not too little.

Annabeth Chase, explaining ADHD to Percy Jackson in The Lightning Thief.

Attention-Deficit Hyperactivity Disorder (abbreviated as ADHD) is characterized by high levels of inattention, being highly distractible, impulsive and restless, hyperactive or hypersensitive. Most demigods are labeled as suffering from ADHD, but it is actually a sign of their heightened senses and natural aptitude for battle. ADHD also gives demigods greater battlefield reflexes and the ability to see where their opponents will strike due to the tensing of their muscles. It is usually coupled with dyslexia in demigods.

Percy Jackson and the Olympians

Percy Jackson

In the series, ADHD is present everywhere from The Lightning Thief to The Last Olympian. Grover Underwood tells Percy that ADHD makes him inattentive to other things whenever he is in class. Grover also says that the instinct makes him want to get up and get outside to release that energy. Percy states that having ADHD makes a demigod very impatient, as Thalia Grace showed in The Last Olympian.

The Heroes of Olympus

All introduced demigod characters, with the exception of Frank Zhang, have ADHD (all Frank has is lactose intolerance). Leo Valdez, on the other hand, has been said to be extremely ADHD (even for a demigod), but no mention has been made about him being dyslexic.


  • Frank Zhang is currently the only known demigod to not have ADHD, while Leo Valdez is the demigod with the most serious case of ADHD.
  • ADHD makes demigods more aware of their surroundings, as stated by Annabeth.
  • The idea of demigods having ADHD and dyslexia came from Rick Riordan's son, Haley Riordan, having both learning disabilities.
  • ADHD has the ability to make demigods more alert during battles.

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