Challenges in diagnosing attention-deficit/hyperactivity disorder in pediatric practice: A regional and global perspective

Table 4 Red flags suggesting alternative or additional diagnoses in attention-deficit/hyperactivity disorder evaluation

Red flag	Possible alternative/comorbid diagnosis	Clinical considerations
Global developmental delay or speech-language regression	ASD, intellectual disability	Consider formal developmental assessment; atypical social interaction or communication delays may indicate ASD rather than ADHD
Sudden onset of attention issues or behavioral changes	Trauma, acute stress reaction, seizure disorder	Explore psychosocial history, trauma exposure, or neurologic causes (e.g., seizures or head injury)
Nighttime symptoms (e.g., restlessness, tiredness in day)	Sleep disorders (e.g., obstructive sleep apnea, restless legs syndrome)	Sleep studies or ear, nose, and throat referral may be needed; ADHD-like symptoms can result from poor sleep quality
Severe mood swings, irritability, or aggression	Pediatric bipolar disorder, disruptive mood dysregulation disorder	Consider psychiatric referral; ADHD rarely causes episodic rage or mood lability independent of context
Excessive worry, fearfulness, or physical complaints	Anxiety disorders	Anxiety can lead to poor attention and school avoidance; distinguish internalizing symptoms from inattentiveness
Social withdrawal, anhedonia, poor appetite or sleep	Depression	Mood screening is warranted if signs of low motivation, fatigue, or sadness dominate
Academic difficulties in reading, writing, or math only	Specific learning disorders	Targeted psychoeducational testing may be needed to rule out dyslexia, dysgraphia, or dyscalculia
Oppositional or defiant behavior predominates	ODD, conduct disorder	Consider whether attention problems are secondary to behavior regulation or environmental issues
Seizure-like episodes, staring spells	Absence seizures, epilepsy	Neurology consult or electroencephalography may be indicated; brief inattentive spells could be seizure activity
Hallucinations, paranoia, disorganized thinking	Early-onset psychosis	Rare in children; prompt psychiatric evaluation is critical

ADHD: Attention-deficit/hyperactivity disorder; ASD: Autism spectrum disorder; ODD: Oppositional defiant disorder.