Why So Many Girls and Women Are Only Now Being Diagnosed with Autism

Diagnosing the Hidden: A Study That Changes How We See Autism

Autism is no longer considered a rare condition. It's become increasingly common, especially in children and young adults. But what's less widely known is that the pattern of diagnosis has changed significantly in recent years—and it's particularly striking when you look at how boys and girls are diagnosed.

In a comprehensive study analyzing electronic health records from more than 171,000 patients over an eight-year period, researchers from Saint Louis University uncovered a significant shift. While diagnoses among males remained relatively consistent, the number of females receiving autism diagnoses rose sharply after 2020. The study, published in JAMA Network Open, reveals that this isn't just about more cases—it's about better recognition.

"For women on the autism spectrum, particularly those who have eluded diagnosis until adulthood, they often engage in significant social camouflaging or masking, which is a conscious effort to conform to social conventions that don't come naturally to them," said lead researcher Dr. Erick Messias.

The Problem of Masking

One of the most critical findings from the research was the delay in diagnosis among girls and women. On average, females received an autism diagnosis 3.4 years later than males, with the average age of diagnosis at 15.7 years for women versus 12.3 years for men.

This delay isn't trivial—it can have real-life consequences. Early diagnosis often unlocks crucial support services such as educational interventions and behavioral therapies that help individuals better understand themselves and navigate social situations more effectively. When these resources aren't accessed early, it can leave people feeling isolated and misunderstood for years.

The reason behind this delay is not hard to guess: autistic traits in females often manifest differently than in males. The condition isn't defined by a single behavior but by a constellation of characteristics that may be more subtle or disguised. That's where masking comes into play.

Masking is the practice of concealing or camouflaging one's autistic traits to fit in socially. It's a learned skill, often developed as a survival mechanism, and it can make it incredibly difficult for healthcare professionals to detect signs of autism in girls and women—especially when those signs don't present as obvious behavioral issues.

Why Diagnosis Has Been Delayed

Historically, diagnostic criteria were based on observations from boys and men. This has created a bias that often leads to missed diagnoses in females. As Dr. Messias pointed out, "The same diagnostic trend was seen in Attention Deficit Hyperactivity Disorder (ADHD) and led to delayed referral and diagnosis in females as well, so it's not surprising we see a similar pattern across these two conditions."

But the differences go beyond social norms. Symptoms like anxiety or depression are often misinterpreted as primary conditions, masking the underlying autism. In fact, many autistic women report being diagnosed with mental health disorders before their autism is identified. The comorbidity rates between autism and other conditions—like immune-related disorders, chronic fatigue, and fibromyalgia—are high, which further complicates early detection.

What This Means for Families and Friends

For families, partners, or friends of autistic individuals, understanding the impact of masking is key. It's not just about seeing behaviors that seem out of place; it's about recognizing emotional exhaustion and hidden struggles that may have been overlooked.

Dr. Messias advises that family members and friends should listen, validate experiences, and give space for individuals to explore what this new understanding means for them personally. "They don't have to see every past experience in exactly the same way, but they can listen, respect her perspective, and give her the space to explore what this new understanding means for her," he said.

The Broader Implication: A Shift in Awareness

This study also highlights a broader shift in how autism is being recognized. The rise in diagnoses among females may reflect not only improved diagnostic practices but also increased awareness and societal openness to the idea that autism exists on a spectrum and can look different for everyone.

It's worth noting that the diagnosis of Asperger's syndrome, once a distinct category, has largely been replaced by the broader term "Autism Spectrum Disorder." This change may reflect evolving clinical understanding, but also underscores how diagnostic practices have matured over time. In many cases, the newer classifications better capture the nuances of how autism appears in different individuals.

Looking Ahead: Improving Support and Recognition

The key takeaway from this research is that we need more nuanced approaches to diagnosing and supporting autistic people—especially women and girls. The current system, while improving, still lags behind the reality of how autism presents in different populations.

Future efforts must focus on training healthcare providers, educators, and even family members to recognize signs of autism in non-traditional presentations. That means being more attuned to internal distress signals, like anxiety or depression, which may be linked to autism rather than standalone conditions.

In the meantime, this study serves as a wake-up call for all stakeholders involved in autism care. It's not just about numbers anymore—it's about understanding and addressing the long-standing disparities in diagnosis that have left many women and girls without the support they need, often for years.

Final Thoughts

This new data is a critical step toward a more inclusive and accurate understanding of autism. As we move forward, it's essential to keep an eye on how these insights are applied in real-world settings. For those who have been living with the silent struggle of masking, this study offers hope that better support and earlier recognition may be within reach.

It's also a reminder of how crucial it is for healthcare systems and communities to continue evolving their practices—not just to identify more cases, but to truly understand the diverse ways in which autism manifests across gender lines.