You got your ADHD diagnosis, and for a while that was enough. It explained a lot. Then someone mentioned anxiety, or autism, or dyslexia, or a sleep disorder. And suddenly there was another thing to make sense of, another label to sit alongside the first one. If you have ever thought “why can it never just be one thing?”, you are not imagining it. ADHD comorbid conditions are not rare. They are the norm. Research consistently shows that the majority of people with ADHD have at least one other diagnosable condition alongside it, and many have two or more.
This post is about understanding why that happens, what the most common companions look like, and what to do if you think something else might be going on. It is not a diagnostic tool. It is a map, so you know what you are looking at.
What does comorbid actually mean?
Comorbid is a clinical word that sounds more alarming than it is. It simply means two or more conditions existing in the same person at the same time. That does not mean one caused the other, or that one is more important. It means they share space, and they often share wiring.
ADHD is a neurodevelopmental condition, which means it affects how the brain develops and functions from early life. Many other neurodevelopmental conditions (autism, dyslexia, dyspraxia) and mental health conditions (anxiety, depression) draw on overlapping brain systems. When one set of systems works differently, it is common for others to work differently too. That is why ADHD rarely travels alone.
The companions: what commonly sits alongside ADHD
Anxiety
This is the most common overlap. Studies show that anxiety disorders are significantly more prevalent in people with ADHD than in those without. For girls and women, the overlap is especially high because ADHD symptoms are often misread as anxiety in the first place. The constant mental juggling, the fear of forgetting something, the social hyperawareness. These look like anxiety. In some cases they are anxiety. In others they are ADHD running at full speed. Often they are both.
Depression
Depression in ADHD often does not look like the textbook version. It can show up as burnout, emotional flatness, withdrawal, or a creeping sense that nothing you do is ever enough. Research on women with ADHD found higher rates of depression compared to men, and that women were more likely to receive treatment for depression before anyone thought to assess for ADHD. The depression is real. But treating it without addressing the ADHD underneath often means it keeps coming back.
Autism (AuDHD)
This one is getting a lot of attention, and for good reason. Research suggests that 50 to 70 per cent of autistic individuals also meet the criteria for ADHD. From the other direction, a 2025 longitudinal study found that roughly 45 per cent of adults with ADHD show significant autistic traits. The term AuDHD is not an official clinical diagnosis, but it describes something many people recognise from the inside: the push-pull between needing routine (autism) and craving novelty (ADHD), the social exhaustion of masking on two fronts, and the confusion of traits that seem to contradict each other.
Dyslexia
Somewhere between 20 and 40 per cent of children with ADHD also have a co-occurring reading difficulty, and a similar proportion of children with dyslexia also have ADHD. The two conditions affect different systems (attention versus language processing), but they share genetic risk factors and they compound each other in the classroom. If reading takes enormous effort and attention is already limited, school becomes twice as hard without anyone understanding why.
Sleep disorders
Most people with ADHD have some kind of sleep difficulty. Trouble falling asleep, trouble waking up, restless sleep, delayed sleep phase (where your body clock runs later than the world expects). Sleep problems worsen every single ADHD symptom: attention, emotional regulation, working memory, impulse control. The relationship runs both ways, because ADHD medication can also affect sleep. It is one of the most under-discussed overlaps, and one of the most impactful.
Sensory processing differences
Not a standalone diagnosis in most clinical systems, but very real. Many people with ADHD experience sensory input differently: certain textures feel unbearable, background noise makes concentration impossible, bright lights cause physical discomfort. When sensory processing differences sit alongside ADHD, the environment becomes an active obstacle. A noisy classroom is not just distracting. It is overwhelming.
Eating difficulties
The relationship between ADHD and disordered eating is significant and underexplored, particularly in girls and women. A systematic review found that the prevalence of ADHD in people with eating disorders ranged up to 18 per cent, and that women with ADHD had up to a 21.8 per cent lifetime prevalence of developing an eating disorder. Impulsivity, emotional regulation difficulties, sensory sensitivities around food, and the dopamine-seeking that drives binge eating all connect ADHD to eating patterns that deserve proper support, not shame.
Astigmatism and vision differences
This is the one most people do not expect. A 2022 meta-analysis in Molecular Psychiatry, covering over 3.2 million participants, found that people with ADHD have a significantly increased risk of astigmatism. A 2026 cohort study found over 50 per cent higher ADHD rates in people with astigmatism, with the association more pronounced in females. The connection appears to involve dopamine, which plays a role in both attention regulation and eye development. It is a reminder that ADHD is not just about attention. It is a whole-brain, whole-body condition, and its companions show up in places you would not expect.
Why ADHD comorbid conditions matter more for girls and women
Girls and women with ADHD are more likely to present with comorbid conditions such as anxiety, depression, and eating difficulties than boys and men. They are also more likely to receive a diagnosis for the comorbid condition first, and to be treated for it without anyone looking deeper. A girl diagnosed with anxiety at 13 might not get her ADHD diagnosis until her twenties. By then, she has spent years wondering why the anxiety treatment only half works, and why she still feels like she is holding everything together with her fingernails.
When one condition masks another, the full picture stays hidden. And when the full picture stays hidden, the support never quite fits.
What to do if you think something else is going on
If you are reading this and recognising yourself in more than one section, here are some practical next steps.
Write down what you notice. Not a self-diagnosis. Just a record. “I struggle with reading speed as well as concentration.” “I find social situations exhausting in a way that goes beyond shyness.” “I cannot sleep no matter what I try.” Specific observations give a GP or clinician something to work with.
Bring it up with your GP. You are allowed to say “I have an ADHD diagnosis, but I think there might be something else going on too.” If the response is “it is just your ADHD”, you are allowed to push back. Ask for a referral. Ask what screening is available. You know your own experience better than a ten-minute appointment can capture.
Talk to someone who knows ADHD in girls and women. Not all clinicians understand how ADHD comorbid conditions present differently in females. If you can, look for a professional with experience in neurodivergent girls and women. Organisations like ADHD UK can help you find the right support.
Read around it. We have written about emotional dysregulation and the signs of ADHD that get missed in girls on this blog. Both posts touch on how overlapping conditions complicate the picture. The more language you have for your own experience, the better you can advocate for yourself.
Knowing is not bad news
Finding out that ADHD comes with companions can feel like a lot. Another label. Another thing to manage. But here is what it actually is: better information. And better information means better support, better self-understanding, and less time spent wondering why the first set of answers did not quite fit.
ADHD comorbid conditions are not a sign that something is wrong with you. They are a feature of how neurodevelopmental wiring works. The more clearly you can see the full picture, the more precisely you can ask for what you need. You are not “too complicated.” You are just getting the whole map.
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