Adult Autism and ADHD Diagnosis- Making Sense of a Late Discovery
For many adults, discovering they may be autistic or have ADHD doesn’t come from a formal assessment straight away. It often starts with a moment of recognition- reading something, hearing someone else’s experience, or finally finding language that fits. For some, that leads to a formal diagnosis. For others, self-identification feels like the right and sufficient step. Both experiences are increasingly common, and both deserve thoughtful understanding.
What does a late diagnosis mean?
Autism and ADHD have historically been under-recognised, particularly in people who don’t fit narrow or outdated stereotypes. This means many adults grew up without their differences being identified or understood. A later diagnosis can bring a mix of emotions. From my experience this includes relief and validation (“this explains so much”), grief for missed support or misunderstanding earlier in life, anger or frustration about being overlooked and it often brings about a period of re-evaluating identity and past experiences. For many, it reframes years of wondering why things felt harder than they seemed for others.
Growing up without a diagnosis
Without the right framework, sensory, social, or executive functioning differences are often misunderstood- by others and by the individual themselves. This can lead to:
- Being labelled as “too sensitive,” “lazy,” or “difficult”
- Internalising a sense of failure or not meeting expectations
- Developing coping strategies that mask difficulties (often at a cost)
- Increased risk of anxiety, burnout, or low self-esteem over time
By adolescence and adulthood, many people have become highly skilled at adapting, but that doesn’t mean things feel easy or sustainable.
The rise of self-identification
More adults are now recognising themselves in descriptions of autism and ADHD, particularly as awareness has improved and more diverse experiences are being shared. There are several reasons why someone might choose to self-identify rather than pursue a formal diagnosis. Financial barriers, long NHS waiting lists, a reduced need for a formal report, or a personal sense that self-understanding is more important than external validation. From our experience, self-identification is rarely a casual or impulsive decision.
Where formal diagnosis can help
A formal diagnosis can still play an important role for some people, but iy may not be the right choice for everyone. It may provide:
- Access to workplace or educational accommodations
- A clearer pathway to certain types of support or services
- A shared language when working with professionals
Where support fits in
Understanding your neurotype is often just the starting point. The next step is figuring out what actually helps in day-to-day life. This might include adjusting environments to reduce sensory overwhelm, using tools and strategies to support focus, regulation, or rest, building awareness of personal patterns and needs and accessing support from professionals, including Occupational Therapists
Occupational Therapy can of course be particularly helpful in translating insight into practical, meaningful changes. However, there are several high quality ASD diagnosis specialists available, such as The Divergent Space, who can offer a full package of support.
The most important message is to move forwards on your terms.