The increasing number of autism diagnoses has drawn widespread attention, with some questioning the rapid rise. While concerns have been raised about the growing prevalence, experts at Northeastern University suggest that heightened awareness and earlier diagnoses are key factors behind the trend. Autism, only officially recognised as a disability in 1990, remains an evolving field of study. Improved understanding and changes in diagnostic criteria, including the recognition of autism as a spectrum disorder, have contributed to the increase in cases.

Greater public awareness and more sophisticated screening methods have led to earlier and more accurate identification of autism in children. Historically, research was largely centred on middle-class white populations, but growing recognition that autism affects individuals from all ethnic and cultural backgrounds has broadened diagnostic scope. Additionally, clinicians now acknowledge that conditions such as Down syndrome and ADHD can co-exist with autism, further increasing reported cases. While boys remain more frequently diagnosed, awareness has improved for girls, who often present different symptoms.

Alongside better identification, various genetic and environmental factors also play a role. Researchers highlight inherited genetic mutations, increasing parental age, and improved survival rates for premature babies as possible contributors. However, autism lacks a single biological marker, relying instead on clinical assessments and behavioural observations. This makes standardised screening tools essential in ensuring early intervention, which can significantly improve long-term outcomes.

Since 2007, the American Academy of Paediatrics has recommended universal autism screening at 18 and 24 months to facilitate early support. Research indicates that states with more consistent screening approaches identify more cases, while others may overlook children needing support.