Questions after a late diagnosis

Why does a late diagnosis feel so lonely?

By Jenny Lucas. From my essay When Nobody Gets It But You, first published 2 June 2026.

I sat in my eldest daughter’s bedroom after my autism diagnosis and the first thought I had was, who do I tell.

Not how. WHO. The list was painfully short, and it had nothing to do with how loved I am. The people in my life were brilliant and would do anything for me. The problem was that most of them had never read a word about autism, never knowingly met an autistic adult and were going to need me to explain it from scratch, while I was still reeling with the information myself.

That moment, the post diagnosis shock, is what I think of now when people talk to me about late diagnosis. Not the diagnosis itself particularly, but the bit afterwards. The bit where you’re holding something massive and you start to realise that nobody around you can actually hold it with you. This is what I want to write about today. The specific kind of aloneness that nobody warns you about when you get a late autism or ADHD or AuDHD diagnosis. What it is that nobody quite gets. Why they don’t get it. And what, in my experience, actually shifts it.

What it is that nobody gets

The thing that’s hard to explain to people who haven’t lived it is that the diagnosis isn’t really about the diagnosis. It’s about everything the diagnosis explains.

It’s the suddenly making sense of why you’ve been exhausted for thirty plus years. Why you’ve never been able to sustain the things other people sustain effortlessly. Why your nervous system has always reacted the way it has to fluorescent lights, to background noise, to the wrong fabric on the wrong day. Why social situations have always cost you triple what they seem to cost everyone else.

It’s the rereading of your entire life through a different lens. The reframing of every moment you thought you were just bad at being a person. The realisation that what you’ve been told for forty years was a personality flaw, or a discipline problem, or a lack of effort, was actually a neurological difference operating in a world that wasn’t designed for it.

It’s huge! And it’s continuous. The revelations don’t happen once, they keep happening. Every time you notice something else. Every time you remember another moment that makes sense now. Every time you catch yourself masking and realise just how much energy that one tiny thing has been costing you, on repeat, for decades.

That’s what nobody around you gets. Not for lack of love, for lack of lived experience, knowledge and understanding.

Why they don’t get it

There are a few reasons and they all stack on each other.

The first is that for most people in their forties and fifties and beyond, autism and ADHD are not their territory. Their idea of what autism looks like was formed in the eighties and nineties, when public understanding was narrower and almost entirely centred on stereotyped presentations in young boys. Their idea of what ADHD looks like is the same shape but for hyperactive kids. They love you, they just don’t have the frame of reference. When you say you’re autistic, they’re matching it against a picture in their head that doesn’t include you.

The second is that you’ve spent your whole life making it impossible for them to see. That’s what masking is. It’s the lifetime project of presenting as a slightly different person to whoever is in front of you so they don’t notice the cost. The people around you have known the masked version for decades so the unmasked version is a stranger to them. Of course they can’t see what you’re describing, you’ve been a master at hiding it from them and most likely yourself too.

The third is that the post-diagnosis processing is happening in your head, mostly, and most of the people around you are not in there. You’re connecting dots they don’t know exist. You’re grieving for a version of yourself they never met. You’re living with the realisation that some of the relationships and choices and survival strategies that defined your life were responses to a context they don’t share.

None of this makes them bad people, obviously, it just makes them not the people who can hold this particular thing with you.

Why community is the answer

I spent quite a long time after my diagnoses trying to make the people in my life into the people who could hold this with me. Articles forwarded. Conversations attempted. Books recommended. Memes and social media posts sent on Whatsapp. Patience deployed and redeployed.

It helped some with some people but it didn’t fix the loneliness. The loneliness wasn’t actually solely about whether the people in my life understood me, it was about being the only person in my immediate world who had lived this specific experience. And no amount of explanation can rewrite somebody else’s lived experience.

What actually shifted it for me was meeting other late-diagnosed people. Online first, then properly. People who didn’t need me to back up to explain the basics. Who recognised the carpark moment without me describing it because they’d had their own version. Who knew without being told what it was like to suddenly understand your own life in a way that nobody else around you could.

The relief of that is hard to overstate. What you get is recognition. The nervous system response of being properly understood is genuinely different from anything else I’ve encountered and I don’t think there’s a workaround for it. The only way to have it is to be in a room with other people who have lived this.

That’s what community does for late-diagnosed adults. It removes the lifelong job of explaining yourself. For people who have been translating their inner life into something legible to others for forty or fifty years, that removal is the closest thing to genuine rest your nervous system can have.

It’s not a nice extra. It’s the thing.

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