But isn’t it "Just" One Thing?

If you've been following The Honest Journey, you might have read my recent piece about living with undiagnosed neurodivergence. But there's something I didn't fully explore in that article: for most of us, it's never just one thing.

Maybe you've got an ADHD diagnosis, but you also can't sleep. You're anxious all the time. Your stomach never feels quite right. You're exhausted in ways that coffee can't fix. Maybe you've mentioned these things to doctors over the years, but they've been treated as separate, unrelated problems. A pill for this. A referral for that. Nobody ever stepped back and looked at the whole picture.

Sound familiar?

You're not imagining it. These things really are connected. And understanding how they fit together might just change everything.

Why Do These Conditions Travel Together?

Let's start with a number that might surprise you: around 70% of people with neurodevelopmental differences have at least one other condition alongside it. For some, it's two or three. For others, it's a whole collection that makes daily life feel like an obstacle course.

This isn't bad luck. It's not because you're somehow more broken than everyone else. There's actually a reason for it.

Many of these conditions share the same roots. The same genes that influence whether someone develops autism or ADHD also affect things like anxiety, sleep regulation, gut function, and how our bodies handle stress. Think of it like a tree with many branches: the trunk is your neurology, and the different conditions are branches growing from the same source.

But there's another layer to this. Living in a world that doesn't understand you, year after year, takes a toll. The chronic stress of masking, of trying to fit in, of constantly feeling like you're failing at life, this doesn't just affect your mind. It affects your whole body.

The Mental Health Connection

Let's talk about the conditions you've probably heard of, and maybe even been diagnosed with.

Anxiety is incredibly common in neurodivergent people. Between 23% and 42% of autistic individuals experience an anxiety disorder, and it's similarly high in ADHD. But here's what's often missed: anxiety in a neurodivergent person might look different. It might be triggered by sensory overload, by unexpected changes, by the sheer exhaustion of pretending to be "normal" all day. Standard anxiety treatments don't always help because they're not addressing the real source.

Depression affects 26% to 37% of autistic adults, which is three times higher than the general population. And it's not hard to understand why. Imagine spending your whole life feeling like you're on the outside looking in, never quite belonging, never quite getting it right. That kind of loneliness and repeated disappointment wears you down.

OCD shows up in about 17% of autistic people and 12% of those with ADHD. The overlap between autistic routines and OCD rituals can be confusing, even for professionals, which is why it's often missed or misunderstood.

And then there's the tricky one: Borderline Personality Disorder (BPD). Many women who are actually autistic get diagnosed with BPD instead. The emotional intensity, the relationship struggles, the identity confusion, these can look like BPD on the surface, but they often stem from unrecognised autism. If you've been given a BPD diagnosis and treatments haven't helped, it might be worth exploring whether there's something else going on underneath.

It's Not All in Your Head: The Physical Side

This is where things get really interesting, and where a lot of people finally start to feel validated.

Neurodivergence doesn't just affect your brain. It affects your whole body. And many of the physical symptoms you've been battling might actually be part of the same picture.

Sleep problems affect over 50% of neurodivergent children, and it doesn't magically get better in adulthood. Racing thoughts, difficulty switching off, sensitivity to light and sound, irregular body clocks, these all make sleep a nightly battle for many of us.

Gut issues are surprisingly common. Between 30% and 70% of autistic people experience gastrointestinal problems like constipation, diarrhoea, bloating, or reflux. The gut-brain connection is real, and researchers are only just beginning to understand how deeply our digestive system and our neurology are intertwined.

Hypermobility and joint pain show up far more often in neurodivergent people than you'd expect. If you're bendy, prone to injuries, or deal with chronic pain that no one can quite explain, you're not alone. Conditions like Ehlers-Danlos Syndrome and hypermobility spectrum disorders are increasingly being linked to autism and ADHD.

Sensory sensitivities aren't just about finding certain textures annoying. For many neurodivergent people, sensory input can be genuinely overwhelming or even painful. Bright lights, loud sounds, certain fabrics, strong smells, these aren't preferences. They're neurological responses that can trigger anxiety, meltdowns, and physical exhaustion.

Epilepsy occurs in 20% to 40% of autistic individuals, compared to just 1-2% of the general population. If you've experienced seizures or unusual episodes that doctors couldn't explain, this connection is worth knowing about.

Why Nobody Connected the Dots

If all these conditions are so connected, why has no one ever mentioned it to you?

The truth is, our healthcare system isn't set up to see the whole person. You see a GP for one thing, a gastroenterologist for another, a psychiatrist for something else. Each specialist looks at their piece of the puzzle, but nobody steps back to see how the pieces fit together.

There's also something called diagnostic overshadowing. Once you have one diagnosis, everything else gets blamed on it. Struggling to sleep? "That's just your anxiety." Stomach problems? "Probably stress." Exhausted all the time? "Well, depression does that." The underlying neurodivergence that might explain all of it never gets considered.

And let's be honest: most GPs have about ten minutes with you. That's barely enough time to address one problem, let alone untangle a lifetime of interconnected symptoms.

What Does This Mean for You?

If you're reading this with a growing sense of recognition, here's what I want you to take away:

You're not a hypochondriac. Having multiple conditions doesn't mean you're making things up or being dramatic. It means your body and brain are connected in ways that medicine is only beginning to understand.

You deserve comprehensive care. If you suspect you might be neurodivergent, push for an assessment that looks at the whole picture, not just the most obvious symptoms. And if you already have a diagnosis, don't let other symptoms be dismissed as unrelated.

Understanding the connections can guide better treatment. When you know that your anxiety might be rooted in sensory overload rather than irrational fears, you can seek support that actually addresses the cause. When you understand that your sleep problems are neurological, you can stop blaming yourself for not being able to "just relax."

Self-compassion matters more than ever. Living with multiple conditions is genuinely hard. It's not a character flaw. It's not lack of effort. Your body is dealing with a lot, and you deserve kindness, especially from yourself.

You're Not Too Much

I know what it's like to feel like your list of symptoms is embarrassingly long. To worry that doctors think you're exaggerating. To wonder if maybe everyone feels this way and you're just weaker than everyone else.

You're not weak. You're not too much. You're not making it up.

You're a whole person with a beautifully complex system that happens to work differently from what society expects. And the more we understand about how these conditions connect, the better we can advocate for ourselves and each other.

You deserve answers. You deserve support. And you deserve to be seen as the complete, interconnected human being that you are.