When Anxiety Isn’t Just Anxiety: Conditions That Look Similar?

Your doctor said it’s anxiety, prescribed medication, and sent you on your way. But the treatment isn’t working, your symptoms keep getting worse, and you’re wondering if something else is going on. You’re not imagining it. Research shows that up to 40% of people with certain mental health conditions get misdiagnosed with anxiety first, sometimes for years. This guide breaks down the conditions that look like anxiety but aren’t, and how to get the right diagnosis.

Look, if someone tells you “it’s just anxiety,” but you’ve tried three different medications, done therapy for months, and nothing is really improving, there’s a good chance you’re dealing with something else. Or something in addition to anxiety.

The problem is that anxiety symptoms overlap with dozens of other conditions. Racing thoughts, trouble concentrating, restlessness, irritability, sleep problems. These show up in ADHD, bipolar disorder, PTSD, thyroid problems, and even heart arrhythmias. A quick assessment in a 15-minute appointment can easily miss the bigger picture.

This isn’t about blaming doctors. It’s about understanding that psychiatric diagnosis is complicated, symptoms overlap significantly, and getting the full story takes time. The good news is that when you know what to look for, you can advocate for a more thorough evaluation.

The Comorbidity Problem: When Anxiety Comes With Something Else

Here’s what makes this tricky. Most people with anxiety don’t just have anxiety. Research consistently shows that 25-50% of youth with depression also meet criteria for an anxiety disorder. The relationship goes both ways, but it’s not symmetrical.

Among young people with primary depressive disorders, about 25-50% also have a comorbid anxiety disorder. But among those with primary anxiety disorders, only 10-15% have concurrent depression. This means if you walk into a doctor’s office with both anxiety and depressive symptoms, there’s a good chance the anxiety is what they’ll focus on first, even if depression is the bigger issue.

Why Comorbidity Gets Missed

Studies of comorbidity often focus on full diagnostic criteria. If you have significant depressive symptoms but don’t quite meet the threshold for major depressive disorder, that might get overlooked. The anxiety gets the diagnosis, the depression gets classified as subsyndromal, and treatment focuses on the wrong target.

A recent study tracking over 1,200 adolescents from ages 10 to 18 found that nearly 74% experienced clinically significant depression or anxiety symptoms at some point. Of those, about 48% had comorbid symptoms, meaning both conditions were present at the same time. The estimated mean age for first report was 13.6 years for anxiety and 14.1 years for depression.

Bipolar Disorder Mistaken for Anxiety

This is one of the most common and consequential misdiagnoses in psychiatry. Up to 40% of people with bipolar disorder are initially misdiagnosed, most often as major depressive disorder, but also as generalized anxiety disorder, panic disorder, or borderline personality disorder.

Here’s why it happens. Most people with bipolar disorder first seek help during a depressive episode, not during mania or hypomania. Depression feels awful, mania often feels good or at least energizing, so people don’t report it. When you show up to your doctor reporting low mood, poor concentration, sleep problems, and anxiety, all they see is depression and anxiety.

The Symptoms That Get Confused

Racing thoughts can occur in both anxiety and hypomania. Irritability shows up in depression, anxiety, and mania. Sleep problems are universal. Difficulty concentrating happens in all of these conditions. The key difference is in the pattern and context.

Why Bipolar II Is Particularly Tricky

Bipolar II disorder, which involves hypomania rather than full mania, is even more likely to be misdiagnosed. Hypomania is less intense, doesn’t typically involve psychosis, and can look like anxiety or agitation rather than an elevated mood state. People with bipolar II also spend more time depressed than hypomanic, which further obscures the diagnosis.

Research shows that only 20% of people with bipolar disorder who seek help during a depressive episode receive the correct diagnosis within the first year of treatment. The average delay to diagnosis is 5-10 years. During that time, they’re typically treated with antidepressants alone, which can trigger mood cycling and make the illness worse.

The Family History Factor

One of the strongest predictors of misdiagnosis is the absence of taking a detailed family history. Studies show that the absence of a positive family history for bipolar disorder predicts misdiagnosis with a relative risk of 2.48. In other words, if your clinician doesn’t ask about family psychiatric history, they’re missing crucial diagnostic information.

If you have first-degree relatives (parents, siblings) with bipolar disorder, major depression, or suicide, your risk for bipolar disorder is significantly elevated. This should change the diagnostic approach, but often it doesn’t get asked.

ADHD That Looks Like Anxiety

ADHD and anxiety share so many symptoms that studies report a symptom overlap of 60-90%. Racing thoughts, restlessness, difficulty concentrating, sleep problems, irritability. The clinical presentation can be nearly identical.

What makes this particularly complicated is that approximately 20% of people with ADHD also have bipolar disorder, and up to 1 in 6 patients with bipolar disorder has comorbid ADHD. These conditions cluster together, making differential diagnosis extremely challenging.

The Pattern That Gives It Away

The key distinction between ADHD and anxiety lies in the persistence and triggers of symptoms. ADHD symptoms are relatively stable over time. You’ve always had trouble focusing, you’ve always been restless, you’ve always struggled with organization. It doesn’t come and go in waves.

Anxiety, by contrast, tends to fluctuate based on stressors. You might have periods where you’re managing well, then something triggers increased worry and your symptoms spike. The baseline shifts. ADHD is more constant, while anxiety is more reactive.

Why ADHD Gets Misdiagnosed as Anxiety

People with ADHD often develop secondary anxiety about their struggles. You’ve failed at enough tasks, missed enough deadlines, forgotten enough appointments that now you’re anxious about forgetting things. The anxiety is real, but it’s a consequence of the ADHD, not the primary problem.

A study examining misdiagnosis patterns found that ADHD was actually overdiagnosed in some settings, with 38% of patients with major depressive disorder and 29% of patients with bipolar disorder incorrectly receiving an ADHD diagnosis. But the reverse also happens. Chronic anxiety and worry can look like inattention and distractibility, leading to missed ADHD diagnoses.

For children and adolescents, this is particularly problematic. Research shows that ADHD, trauma, and severe anxiety often mimic one another and share many common symptoms. In younger patients, hypervigilance and dissociation from trauma can be mistaken for inattention. Impulsivity might result from a stress response in overdrive rather than ADHD.

The Treatment Response Problem

Here’s something that makes this even more confusing. A study found that observational treatment response to stimulants was equally high across ADHD, major depression, and bipolar disorder groups, ranging from 75-82%. This means that even if someone responds to ADHD medication, that doesn’t necessarily confirm the diagnosis.

Stimulants can temporarily improve concentration and energy in anyone, regardless of whether they have ADHD. They can also trigger mania in undiagnosed bipolar disorder patients. Treatment response alone doesn’t validate the diagnosis.

Trauma and PTSD vs. Generalized Anxiety

Complex trauma and PTSD produce symptoms that overlap significantly with generalized anxiety disorder, panic disorder, and even bipolar disorder. The key difference is that with trauma, there’s a marker. Something happened, and things changed afterward.

Hypervigilance in PTSD can look identical to the constant scanning for threats seen in generalized anxiety. Emotional dysregulation from complex trauma can mimic the mood swings of bipolar disorder. Dissociation can be mistaken for inattention. Irritability, sleep problems, difficulty concentrating. All of these show up in both trauma-related disorders and anxiety disorders.

The Diagnostic Overshadowing Problem

Studies show that trauma-related symptoms are particularly prone to diagnostic overshadowing, where the real issue is either missed entirely or misattributed to a different psychiatric diagnosis. A recent study on perceived misdiagnosis found that 42% of patients identified as autistic and 54% of possibly autistic participants either disagreed or only partially agreed with their mental health diagnosis.

The same pattern occurs with trauma. Emotional dysregulation is particularly common in people with a history of trauma or PTSD, and these extreme mood shifts can be mistaken for rapid-cycling bipolar II disorder. Without directly asking about trauma history and listening carefully to the answer, clinicians can completely miss the underlying cause.

When Anxiety Is Actually Hypervigilance

Generalized anxiety is characterized by excessive worry about everyday concerns. Will I perform well at work? Is my relationship okay? Can I pay my bills? The content of the worry makes sense, even if the intensity is disproportionate.

Hypervigilance from trauma is different. It’s a constant state of scanning for danger, an inability to relax because your nervous system has learned that bad things can happen at any moment. The feeling is less about specific worries and more about a pervasive sense of threat.

Patients with PTSD describe it as always being “on edge” or “waiting for the other shoe to drop.” They startle easily, have difficulty feeling safe, and may avoid situations that remind them of the trauma. This isn’t the same as worrying about upcoming events. It’s a fundamentally altered sense of safety in the world.

When Panic Disorder Masks Heart Problems (and Vice Versa)

This is where misdiagnosis can be particularly dangerous. Panic attacks and cardiac events produce remarkably similar symptoms: chest pain, racing heart, shortness of breath, lightheadedness, sweating, sense of doom. Even cardiologists sometimes struggle to differentiate them in the moment.

Studies show that panic disorder is associated with cardiac disease and can be mistaken for heart attacks. About 10% of people with panic disorder have an arrhythmia. More concerning, research on supraventricular tachycardia found that 55% of patients with this cardiac arrhythmia had their condition initially misdiagnosed as panic disorder, with symptoms unrecognized for a median of 3.3 years.

The Gender Disparity in Misdiagnosis

Women face a particularly high risk of dangerous misdiagnosis. Studies show that women are 7 times more likely to be misdiagnosed with anxiety instead of a heart attack compared to men. When a woman presents with chest pain and anxiety, the anxiety diagnosis is often made first, sometimes with fatal consequences.

The study on supraventricular tachycardia found that when PSVT was unrecognized, women were significantly more likely than men to have their symptoms attributed to psychiatric origins, 65% versus 32%. Even 41% of patients who had ventricular preexcitation visible on their ECG, which should have been an obvious sign of a cardiac problem, remained misdiagnosed for years.

The Bidirectional Relationship

Here’s what makes this even more complicated. Panic disorder increases the risk of developing actual heart disease. Men with panic disorder have increased rates of cardiovascular mortality. The tachycardia during a panic attack could potentially trigger an acute heart attack in someone with underlying coronary artery disease.

Research shows that phobic anxiety is actually a stronger predictor of fatal cardiovascular events than traditional cardiac risk factors like smoking, high blood pressure, or high cholesterol. This bidirectional relationship means that sometimes both diagnoses are correct, the patient has both panic disorder and cardiac disease.

POTS and Other Conditions

Postural Orthostatic Tachycardia Syndrome is another condition frequently misdiagnosed as anxiety or panic disorder. POTS causes an abnormal increase in heart rate when moving from lying to standing, at least 30 beats per minute within 10 minutes. Patients experience lightheadedness, visual changes, brain fog, nausea, and fatigue.

The key difference is that POTS symptoms worsen when upright and improve when lying down. They’re also worse in the morning, after hot showers, during hot weather, or following meals. These positional and situational patterns aren’t typical of primary anxiety disorders.

Getting the Right Diagnosis: What Should Happen

A proper psychiatric evaluation should take at least 60-90 minutes for an initial assessment. Anything less and important information gets missed. Here’s what should be included.

Complete Psychiatric History

Your clinician should ask about current symptoms, but also about the timeline. When did symptoms first start? Was there a clear trigger or did things develop gradually? Have symptoms been constant or do they come in waves? This longitudinal view is crucial for distinguishing between conditions.

They should specifically inquire about mood episodes. Have you ever had periods of elevated mood, increased energy, decreased need for sleep, racing thoughts, or impulsive behavior? Even if those periods felt good, they’re diagnostically significant. Most people don’t spontaneously report hypomania because it doesn’t feel like a problem.

Detailed Family History

Three generations of family psychiatric history, if possible. What conditions ran in your family? Any bipolar disorder, major depression, anxiety disorders, ADHD, schizophrenia, or substance use disorders? Any suicides or psychiatric hospitalizations?

Your genetic loading matters. If you have multiple first-degree relatives with bipolar disorder, your treatment approach should be different than someone with no family history, even if your current symptoms look similar.

Trauma Assessment

A comprehensive evaluation must include screening for adverse childhood experiences and trauma. This should be done routinely, not just when someone volunteers the information. Many people don’t connect their childhood experiences to their current symptoms.

Questions should cover physical abuse, sexual abuse, emotional abuse, neglect, household dysfunction, witnessing violence, and other potentially traumatic events. The connection between early trauma and adult psychiatric illness is well-established, but it often gets missed in quick assessments.

Collateral Information

For conditions like bipolar disorder and ADHD, collateral information from family members or close friends can be invaluable. You might not recognize your own hypomanic episodes, but people around you notice when your energy shifts, when you’re sleeping less, when you’re more talkative or impulsive.

This is particularly important for ADHD diagnosis in adults. Childhood history matters, and sometimes parents can provide information about early symptoms that you’ve forgotten or didn’t recognize as significant.

Use of Screening Tools

Validated screening questionnaires should be part of the assessment. The Mood Disorder Questionnaire has good sensitivity (around 70%) and excellent specificity (around 90%) for identifying bipolar disorder. The Adult ADHD Self-Report Scale is useful for ADHD screening. The PCL-5 screens for PTSD.

These tools don’t replace clinical judgment, but they provide structured, standardized information that helps catch symptoms that might otherwise be overlooked in conversation.

Why Correct Diagnosis Matters for Treatment

This isn’t just academic. Getting the right diagnosis fundamentally changes treatment strategy and prognosis. Treating bipolar depression with antidepressants alone can trigger rapid cycling and worsen the illness. Treating ADHD-related anxiety without addressing the underlying attention problems leaves patients struggling. Treating trauma-related symptoms with only medications misses the need for trauma-focused psychotherapy.

Treatment Response as Diagnostic Information

If you’ve tried multiple medications in the same class and none have worked, that’s diagnostic information. Three different SSRIs with no response suggests something beyond straightforward anxiety or depression. Antidepressants that initially work but stop after a few months might indicate bipolar disorder.

Paradoxical reactions to medications are also informative. If benzodiazepines make you more anxious rather than calmer, or if stimulants calm you down rather than revving you up, those responses tell us something about your underlying neurobiology.

The Impact of Comorbidity on Outcomes

When conditions occur together, the prognosis is worse than either condition alone. The research is clear on this. Comorbid anxiety and depression have higher risk of recurrence, longer duration, increased suicide attempts, greater impairment, and less favorable response to treatment compared to either disorder in isolation.

Patients with both ADHD and bipolar disorder experience more mood episodes, shorter periods of stability, earlier age of onset, more severe symptoms, and poorer response to mood stabilizers compared to patients with bipolar disorder alone. They’re also at higher risk for suicide attempts and psychiatric hospitalizations.

This is why comprehensive assessment matters. If we only treat one condition and miss the comorbidity, outcomes will be suboptimal.

The Role of Psychotherapy

Medication alone is rarely sufficient, but the type of psychotherapy matters too. Cognitive-behavioral therapy for depression and anxiety has strong evidence. Dialectical behavior therapy works well for emotional dysregulation and complex trauma. EMDR and prolonged exposure are effective for PTSD.

But these approaches are condition-specific. Using CBT techniques designed for generalized anxiety won’t adequately address complex trauma. Trying to do exposure therapy for PTSD when someone actually has panic disorder from an undiagnosed cardiac arrhythmia is not just ineffective, it’s potentially harmful.

Written By

Cara J. Erkut, M.D.

Board-Certified Psychiatrist | Psychoanalyst | TMS Program Director

Dr. Erkut is a board-certified psychiatrist and psychoanalyst with expertise in differential diagnosis of complex presentations involving anxiety, mood disorders, ADHD, and trauma. She serves as Clinical Instructor at the University of Washington and provides comprehensive psychiatric care at her Mercer Island practice.

Connect on LinkedIn