Researchers analysed data from over 100,000 American families to understand why more teenagers are being diagnosed with multiple neurodevelopmental conditions at the same time. The study looked at teens managing combinations of disorders like ADHD, autism, dyslexia, and anxiety—and found the numbers rising sharply over a seven-year period.
This matters for Singapore families because when a teen has two or more of these conditions together, they face steeper challenges in school, friendships, and daily life. Standard treatments that work for a single condition often don't work as well when multiple disorders are present.
Mental health problems are the strongest warning sign
The most striking finding: teens with depression or anxiety were five times more likely to have multiple neurodevelopmental conditions. This mental health connection was the strongest predictor researchers found across all factors studied. If your teen is struggling with mood or worry, it's worth exploring whether other developmental challenges are present too.
Physical health and family resources both shape who gets diagnosed
Children reporting fair or poor overall health, heart conditions, or being underweight were significantly more likely to have multiple conditions, suggesting these issues are interconnected rather than separate. Children whose parents had higher education levels had lower odds of multiple diagnoses—likely because these families had better access to early screening and specialist services. This points to a real gap: some teens may have undiagnosed conditions simply because their families lack access to assessments.
Girls' symptoms are easier to miss
Boys were diagnosed with multiple neurodevelopmental conditions at nearly 2.5 times the rate of girls. This gap may reflect both genuine biological differences and the reality that girls often present symptoms differently, making their struggles less visible to teachers and parents. A quiet, anxious girl may be overlooked while a disruptive boy gets flagged for assessment.
What to do if you notice multiple struggles
- Don't dismiss a single difficulty as laziness or phase—watch for clusters of warning signs like anxiety, attention problems, and learning struggles together, which suggest multiple conditions need assessment.
- Seek professional evaluation early rather than waiting, since families with better access to specialists achieve earlier diagnosis and more targeted support.
- Remember girls may need closer observation for neurodevelopmental conditions, as their symptoms often present differently and go unrecognised by schools and families.