Experts emphasise that the surge in autism diagnoses in the US reflects greater awareness, broader criteria, and improved access, while warning of persistent disparities and the importance of early, tailored interventions.
Autism diagnoses have risen sharply in the US, but two leading experts say the trend is best understood as a mix of greater awareness, broader criteria, improved access to services and, possibly, a smaller underlying rise in prevalence. In a recent Medscape discussion, Catherine Lord and Fred Volkmar said the increase should not be reduced to a single cause, especially as diagnosis now reaches many children and adults who were previously missed or labelled differently. Their comments echo recent reporting that the strongest growth has come from milder cases, later-life diagnosis and groups that were historically under-identified.
Diagnosis still depends on clinical judgement rather than a medical test. Lord said there is no blood test or scan that can confirm autism, so clinicians must rely on behaviour, developmental history and reports from parents, teachers or the adults themselves. Volkmar said screening tools can help identify children who need further assessment, but they are not definitive and can miss people who mask their differences or who have higher levels of language and cognitive ability. The Cleveland Clinic and Harvard Medical School both note that a proper assessment usually involves interviews, observation and specialist evaluation, rather than an online checklist or a single questionnaire.
The most important early warning signs, the two experts said, are usually social rather than medical: limited eye contact, unusual facial expression, differences in body language, atypical tone of voice and weaker emotional reciprocity. Volkmar pointed to parental concern in infancy as a particularly strong clue, while Lord said concerns raised by grandparents, teachers or friends can also be meaningful. That helps explain why adult diagnosis has become more common, with Harvard and Yale Medicine both noting that many adults are only now receiving assessments after years of uncertainty, often because they were never evaluated in childhood.
Treatment, they said, works best when it starts early and is tailored to a child’s developmental level and interests. Lord described modern behavioural therapy as broader and more naturalistic than older versions of applied behaviour analysis, with an emphasis on helping children communicate, engage and learn in ways that fit everyday life. Volkmar added that good intervention often begins with basic “learning to learn” skills, such as attention and sitting still, and with finding what motivates the child, whether that is movement, play or a favourite snack. Yale Medicine and the Cleveland Clinic similarly stress that early, comprehensive support can improve communication, social development and daily functioning.
Volkmar and Lord also warned that rising diagnosis rates reflect deep inequities in who gets identified, and when. Volkmar said autism has often been missed in Black, Hispanic and lower-income children, while Lord said increases partly reflect better recognition in groups that were previously overlooked, including girls and women. Both said the label can also function as a gateway to speech therapy, occupational therapy and educational support, which may encourage families to seek a formal diagnosis even when the picture is complicated. Recent reporting from The Atlantic and other outlets has raised a related concern: that some people with anxiety, depression or other issues may be misclassified, even as many others are still going undiagnosed.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
