ADHD vs Anxiety: How to Tell the Difference (Finally)

I spent years thinking I just had really bad anxiety.

The racing thoughts, the constant worry about forgetting things, the physical restlessness that made me feel like I might crawl out of my skin. Classic anxiety, right? Except my therapist kept asking questions that didn't quite fit. "Do you worry about the future, or do you forget about the future entirely until it smacks you in the face?" Uh. The second one?

Turns out, ADHD and anxiety look eerily similar from the outside. They both make you feel like your brain is a browser with 47 tabs open and three of them are playing music but you can't figure out which ones. But they come from completely different places, and understanding the difference changed everything for me.

Here's the thing nobody tells you until you're knee-deep in it: about 50% of adults with ADHD also have anxiety disorders, according to research on ADHD and anxiety comorbidity. So if you're reading this thinking "wait, I definitely have both," you're not alone. You're actually in really good company.

But even when they show up together, they're doing different things in your brain. And knowing which is which helps you figure out what actually helps.

The Core Difference (This Changed Everything for Me)

Anxiety is your brain screaming about the future. ADHD is your brain forgetting the future exists.

Let me explain.

Anxiety is hypervigilance. Your brain is constantly scanning for threats, replaying worst-case scenarios, and trying to control outcomes that haven't happened yet. It's exhausting because you're mentally living through disasters that might never happen. The worry feels heavy, sticky, and hard to shake.

ADHD is inconsistent attention and executive dysfunction. Your brain struggles to sustain focus, plan ahead, or follow through on intentions. Not because you're worried, but because your executive functions just.. didn't show up to work today. It's not that you're anxious about the deadline. It's that the deadline literally did not exist in your brain until it was suddenly tomorrow.

CHADD on anxiety and ADHD puts it this way: anxiety makes you overestimate danger and underestimate your ability to cope. ADHD makes you underestimate time and overestimate your ability to "just do it later."

Both feel chaotic. But the chaos comes from different places.

Where They Look Identical (And Why That's So Confusing)

Okay, so here's where it gets messy.

Both ADHD and anxiety can make you: - Restless and unable to sit still - Struggle to focus or finish tasks - Feel overwhelmed by daily life - Avoid things that feel hard - Have racing thoughts - Lose sleep

I literally brought a list like this to my doctor and said "so.. which one is it?" And she laughed (kindly) and said "probably both, but let's figure out what's driving what."

The restlessness test: Are you fidgeting because your brain is spinning with "what ifs" and you physically can't calm down? That's anxiety. Are you fidgeting because sitting still feels physically impossible and you're not even thinking about anything specific? That's ADHD hyperactivity.

The focus test: Are you struggling to focus because intrusive worried thoughts keep hijacking your attention? Anxiety. Are you struggling to focus because your brain keeps wandering to literally anything more interesting, even if you WANT to focus? ADHD.

The avoidance test: Are you avoiding the task because you're catastrophizing about how badly it might go? Anxiety. Are you avoiding it because starting feels impossible, or you keep forgetting it exists? ADHD.

The sleep test: Are you lying awake replaying conversations or worrying about tomorrow? Anxiety. Are you lying awake because your brain suddenly wants to research penguin migration patterns at 2am and you forgot to be tired? ADHD sleep problems.

Sometimes it's both. Sometimes the line is blurry. That's okay.

The Sneaky Part: When ADHD CAUSES Anxiety

This is the plot twist that made everything click for me.

A lot of the time, the anxiety isn't a separate thing. It's a reaction to living with unmanaged ADHD.

You're anxious about being late because you've been late 47 times this month and you can't figure out why time keeps disappearing. You're anxious about forgetting things because you've already forgotten three important things this week. You're anxious in social situations because RSD and rejection fears make every interaction feel high-stakes.

ADDitude's guide to ADHD-anxiety overlap calls this "secondary anxiety." Your brain is literally just trying to compensate for executive dysfunction by staying in hypervigilant overdrive. It's exhausting, but it makes sense.

For me, a huge chunk of my anxiety disappeared when I started treating my ADHD. Not all of it. But the constant low-level panic about forgetting things? That eased up when I built systems that actually worked for my brain.

The anxiety that stayed was the real anxiety. The kind that needed its own attention.

How They Feel Different in Your Body

This is subtle, but it helped me.

Anxiety feels like: - Chest tightness or shallow breathing - A knot in your stomach - Muscle tension, especially in your jaw or shoulders - A sense of dread or impending doom - Your heart racing because you're imagining something bad

ADHD feels like: - Physical restlessness, like you need to MOVE - Impatience or irritability when things feel slow - Sensory overload (too many sounds, lights, textures) - Frustration that feels sharp and sudden - Your heart racing because you just remembered five things at once

Obviously, this isn't a perfect test. But paying attention to what your body is actually doing can give you clues about what's happening in your brain.

Sometimes I'll catch myself pacing and ask: "Am I pacing because I'm worried, or because I just need to move?" The answer tells me what I actually need. Deep breathing? Or a walk around the block?

What Actually Helps (When You're Dealing with Both)

Here's what I've learned works when ADHD and anxiety are both showing up to the party uninvited.

For ADHD: - External structure: timers, alarms, body doubling, visual reminders - Breaking tasks into stupidly small steps - Movement breaks (even just standing up and stretching) - Gentle background noise or music (I keep my Lofi Cutie channel playing when I need to focus without feeling overwhelmed, it helps with both the ADHD restlessness and anxiety-driven overstimulation) - Accepting that some days your brain just won't cooperate

For anxiety: - Grounding techniques (5-4-3-2-1, deep breathing, progressive muscle relaxation) - Challenging catastrophic thoughts (is this worry based on evidence, or just a story my brain is telling?) - Limiting caffeine and doomscrolling - Therapy that actually addresses anxiety, not just ADHD coping skills - Medication, if that's part of your treatment plan

For both: - Sleep (I know, I know, but seriously) - Moving your body in ways that feel good - Not expecting yourself to function like someone without ADHD or anxiety - Finding people who get it (more on that in a second)

The biggest thing? Stop trying to fix both with the same tools. They need different approaches. What calms anxiety might not help ADHD focus. What helps ADHD task initiation might ramp up anxiety.

It's okay to treat them separately.

Getting the Right Diagnosis (When Your Symptoms Overlap)

If you're sitting here thinking "okay but I still don't know which one I have," that's a really valid place to be.

Getting an accurate diagnosis when ADHD and anxiety overlap is tricky. A lot of mental health professionals aren't trained to spot the difference, especially in adults. Especially in women and people socialized as women, who are way more likely to have their ADHD symptoms misread as "just anxiety."

What helped me: - Finding a provider who specifically works with ADHD (not just general therapy) - Keeping a symptom journal: what I was feeling, when, and what seemed to trigger it - Asking myself the questions in this post and bringing my answers to appointments - Being honest about my whole history, not just recent symptoms - Getting a formal ADHD assessment, not just a quick screening

If you suspect ADHD but you've only been treated for anxiety, it's worth pursuing an evaluation. If your anxiety treatment isn't really working, or if you still struggle with focus and follow-through even when you're not anxious, that's a clue.

You're allowed to ask for a second opinion. You're allowed to advocate for yourself.

The Bottom Line

ADHD and anxiety can look identical from the outside, but they feel different on the inside once you learn to pay attention.

Anxiety is worry about the future. ADHD is struggling to plan for the future. Anxiety is hypervigilance. ADHD is inconsistent attention. Sometimes ADHD causes anxiety. Sometimes they're just roommates in your brain.

And a lot of the time, it's both.

You don't have to figure this out alone. We talk about this stuff all the time in The ADHD Nest, our free Discord community. People sharing what actually helps, what the difference feels like for them, and how they learned to manage both without losing their minds. Come hang out: https://join.adhdnest.org/

Your Turn 🪴

Do you deal with both ADHD and anxiety? I'd love to hear how you've learned to tell the difference between the two (or if they're still a tangled mess for you like they are for me sometimes).