An “anxiety attack” is not a formal clinical term, which is part of why recognizing one after the fact can feel so confusing. What most people describe as an anxiety attack lines up with either a panic attack or a spike of acute anxiety intense enough to produce physical symptoms. The hallmarks are unmistakable once you know them: a racing heart, trouble breathing, a feeling of dread that seems wildly out of proportion to anything actually happening. But the experience varies more than most people realize, and several medical conditions can mimic the same set of symptoms.
The Difference Between Anxiety and a Panic Attack
Clinicians draw a clear line between general anxiety and a panic attack, even though everyday language mushes them together. Anxiety tends to build gradually around a specific worry, like an upcoming medical appointment or financial stress. It can last hours or even days, and while it feels miserable, it rarely makes you think you’re dying. A panic attack is different. It arrives abruptly, often peaking within minutes, and brings intense physical symptoms along with a sense of immediate threat. Most panic attacks last fewer than 30 minutes, and they can strike even when nothing obviously stressful is happening.1Health Lab / University of Michigan. Panic attack vs. anxiety attack: 6 things to know
If what you experienced was a slow-building sense of worry that ramped up over hours, that is more consistent with an anxiety episode. If it hit suddenly, peaked fast, and came with a cluster of physical symptoms that made you wonder whether something was medically wrong, you likely had a panic attack. Both are real, both can be severe, and both deserve attention. But the distinction matters because panic attacks have a more defined clinical profile and a well-studied set of treatments.
The Physical Signs That Point to an Attack
The body’s fight-or-flight system is the engine behind the physical experience. During a panic attack, your adrenal glands flood the bloodstream with stress hormones. Research measuring this directly found that epinephrine secretion spiked by an average of about 150% during naturally occurring panic attacks, with large surges in the nerve signals that control muscle blood flow.2Archives of General Psychiatry. Sympathetic Activity in Patients With Panic Disorder at Rest, Under Laboratory Mental Stress, and During Panic Attacks That hormonal surge is what produces the symptoms people remember most vividly:
- Heart racing or pounding: Often the single most alarming symptom. Your pulse may jump to 100 or 120 beats per minute for no clear reason.
- Shortness of breath: Many people hyperventilate during an attack, which drops carbon dioxide levels in the blood and can cause tingling, lightheadedness, and a feeling that you cannot get enough air.3PubMed Central. Hyperventilation in panic disorder and asthma: empirical evidence and clinical strategies
- Chest tightness or pain: Muscle tension in the chest wall, combined with rapid breathing, mimics cardiac pain convincingly enough to send many people to the emergency room.
- Nausea or stomach distress: Anxiety has a strong link to gastrointestinal symptoms. In a large population study, anxiety was most strongly tied to nausea, with more than three times the odds of experiencing it compared to people without anxiety.4PubMed. Are anxiety and depression related to gastrointestinal symptoms in the general population?
- Sweating, trembling, or chills: These are direct consequences of the sympathetic nervous system going into overdrive.
- Dizziness: Partly caused by hyperventilation, but also potentially linked to the vestibular system. People with panic disorder report significant dizziness at rates far above the general population, and studies have found that many of them show measurable inner-ear dysfunction.5PubMed. Dizziness and panic disorder: a review of the association between vestibular dysfunction and anxiety
Not every panic attack includes every symptom on this list. Some people feel overwhelmingly nauseous but never get chest pain. Others have dramatic heart pounding but no dizziness. What the symptoms share is that they peak quickly and feel far more intense than the situation warrants.
The Mental Side of an Attack
Physical symptoms get the most attention, but the mental experience is often what makes a panic attack feel truly terrifying. The most characteristic cognitive feature is what researchers call catastrophic misinterpretation of bodily sensations. Your heart races and your brain immediately jumps to “I’m having a heart attack” or “I’m about to pass out and die.” A meta-analysis found that people with panic disorder show a strong tendency to interpret normal body signals as signs of immediate physical or mental disaster, and this tendency is markedly stronger than what’s seen in people with other anxiety conditions or in healthy individuals.6PubMed Central. Catastrophic misinterpretation of bodily sensations and external events in panic disorder, other anxiety disorders, and healthy subjects: A systematic review and meta-analysis Earlier work confirmed the same pattern: people prone to panic attacks were more likely to read ambiguous body sensations as evidence of impending disaster and to believe those interpretations in the moment.7PubMed. Misinterpretation of body sensations in panic disorder
This creates a feedback loop. Your heart beats faster, you interpret that as dangerous, your anxiety spikes, your heart beats even faster, and the spiral accelerates. If you’re trying to figure out after the fact whether what you experienced was an anxiety or panic attack, ask yourself whether you had an overwhelming conviction that something catastrophic was happening to your body or mind, even briefly. That conviction, out of proportion to any actual threat, is one of the clearest markers.
Feeling Unreal or Detached
One of the more unsettling and less commonly discussed features of panic attacks is a sense of unreality. Some people describe it as watching themselves from outside their own body. Others say the world around them looked flat, dreamlike, or somehow fake. These experiences have clinical names: depersonalization (feeling detached from yourself) and derealization (feeling detached from your surroundings). In one study of patients with panic disorder, about half reported depersonalization symptoms during their attacks.8Comprehensive Psychiatry. Depersonalization and personality in panic disorder
If you felt like the room shifted or you briefly stopped feeling like “yourself” during the episode, that is actually a recognized component of panic and not a sign that you were losing touch with reality in some deeper way. Researchers have been able to induce these feelings in laboratory settings in people with panic disorder, confirming that they are a predictable part of the nervous system’s acute stress response.9Behaviour Research and Therapy. The experimental induction of depersonalization and derealization in panic disorder and nonanxious subjects For many people, this symptom is actually the one that lingers most in memory and causes the most worry after the attack has passed.
Attacks That Wake You From Sleep
Some people’s first experience with a panic attack happens in the middle of the night, which adds a whole extra layer of confusion. Nocturnal panic attacks jolt you awake in a state of intense fear, usually with a pounding heart and a sense that something is terribly wrong. Between 44% and 71% of people with panic disorder report having experienced at least one of these nighttime episodes.10PubMed. Assessment and treatment of nocturnal panic attacks They occur during non-REM sleep, which means they are not triggered by a bad dream. You do not have to be having a nightmare to wake up panicking.11PubMed. Nocturnal and daytime panic attacks–comparison of sleep architecture, heart rate variability, and response to sodium lactate challenge
Because there is no obvious trigger, nocturnal panic attacks often lead people to assume the cause is medical. And it is always worth ruling out sleep apnea, cardiac arrhythmias, or acid reflux if you’re being woken by alarming symptoms. But if the episodes have the same sudden onset, rapid peak, cluster of autonomic symptoms, and resolution within minutes that characterize daytime panic attacks, the underlying mechanism is likely the same.
When It Might Not Be an Anxiety Attack
This is where things get serious, because several medical conditions produce symptoms nearly identical to panic attacks. Ruling them out matters, especially if your episodes are new, if they happen during physical exertion, or if treatment for anxiety has not helped.
Heart rhythm problems are the most important mimic. A case report described a 45-year-old woman who was diagnosed with panic disorder and went through multiple failed anxiety treatments before a particular emergency room visit finally caught that she had a heart arrhythmia called supraventricular tachycardia. Her symptoms, including the rapid heart rate, had overlapped almost perfectly with panic attacks.12PubMed Central. Misdiagnosis of Supraventricular Tachycardia as Panic Attacks: A Case Report Highlighting the Importance of Accurate Cardiovascular Evaluation This is not vanishingly rare. Emergency physicians see this overlap regularly, and a normal resting electrocardiogram does not always catch an intermittent arrhythmia.
Thyroid disorders are another classic mimic. Hyperthyroidism causes the body to produce excess thyroid hormone, and the resulting symptoms, including palpitations, tremors, sweating, and anxiety, can be indistinguishable from an anxiety disorder. Case reports document patients initially diagnosed with generalized anxiety who turned out to have hyperthyroidism.13PubMed Central. Hyperthyroidism Masquerading as an Anxiety Disorder: A Report on a Misdiagnosed Case A systematic review found that anxiety-related symptoms are common enough in thyroid disorders that screening for thyroid problems is now a routine clinical recommendation when someone presents with new anxiety.14PubMed. Hypothalamic-pituitary-thyroid (HPT) axis functioning in anxiety disorders. A systematic review
The practical takeaway: if you have repeated episodes of what feel like anxiety attacks, especially if standard anxiety treatments are not helping, ask your doctor to check your thyroid levels and to consider a cardiac workup that goes beyond a resting EKG. An event monitor worn for a few days or weeks can catch intermittent arrhythmias that a single snapshot misses.
Substances That Can Trigger Attacks
Caffeine, alcohol withdrawal, and stimulant medications are well-known triggers for panic-like episodes, but cannabis deserves a specific mention because the connection surprises many people. Case reports describe patients with no prior psychiatric history developing panic attacks after a period of regular cannabis use.15PubMed Central. A Case of Panic Attacks Developing After 10 Years of Chronic Cannabis Use in a Patient With No Prior Psychiatric History What’s more, cannabis may not just trigger a one-off episode. Clinical reports describe patients who experienced their first panic attack while using cannabis and then continued to have recurrent panic attacks after they stopped using it entirely, suggesting that the drug can unmask an underlying vulnerability.16PubMed. Can cannabis trigger recurrent panic attacks in susceptible patients?
If you are trying to figure out what caused your episode, it’s worth thinking about whether you consumed anything in the hours beforehand. High-THC cannabis products, energy drinks, decongestants containing pseudoephedrine, and abrupt discontinuation of alcohol or benzodiazepines can all push the nervous system into a state that feels exactly like a spontaneous panic attack.
Why Some People Are More Prone Than Others
Sensitivity to internal body signals appears to play a role. Researchers have studied a trait called interoceptive sensitivity, which is essentially how aware you are of your own heartbeat, breathing, and gut sensations. This heightened body awareness has been suggested to play a pivotal role in the development of anxiety disorders, particularly panic.17PubMed. Interoceptive sensitivity in anxiety and anxiety disorders: an overview and integration of neurobiological findings Interestingly, the picture is more nuanced than “panic patients just feel their heartbeat more.” One study found that people with panic disorder were not actually better at detecting their heartbeat than healthy controls in objective tests; what differed was how much they worried about what their body sensations meant.18PubMed Central. The roles of interoceptive sensitivity and metacognitive interoception in panic The problem, in other words, seems to be less about having a sensitive body and more about having a mind that interprets normal sensations as threatening.
Anticipatory anxiety also feeds into future attacks. Research has shown that people with panic disorder develop heightened anxiety specifically in response to unpredictable situations, a pattern that can perpetuate the cycle by increasing the baseline level of nervous-system arousal between attacks.19PubMed Central. Increased anxiety during anticipation of unpredictable but not predictable aversive stimuli as a psychophysiologic marker of panic disorder This helps explain why a single bad panic attack can lead to weeks of heightened anxiety: you are now bracing for the next one, which ironically keeps your nervous system primed to fire.
What to Do in the Moment
If you are having an attack right now, or if you want to be prepared for the next one, the single most evidence-backed immediate intervention is to slow your breathing and, if possible, cool your face. A technique borrowed from the physiology of diving involves applying cold water or a cold pack to the forehead and eye area while slowing your breath. This triggers what’s known as the diving reflex, which activates the parasympathetic nervous system and pushes the heart rate down. A clinical study found that this cold facial immersion task significantly reduced heart rate and self-reported panic and anxiety symptoms in patients with panic disorder.20PubMed Central. The Implications of the Diving Response in Reducing Panic Symptoms
Beyond that immediate step, grounding techniques can interrupt the catastrophic thought spiral. Naming five things you can see, four you can hear, three you can touch, and so on forces the brain to engage sensory processing circuits rather than threat-detection circuits. Reminding yourself that the symptoms will peak and pass within minutes is also genuinely helpful. That is not empty reassurance. Panic attacks physiologically cannot sustain their peak intensity for long, because the body burns through the hormones that fuel them.
For longer-term management, cognitive behavioral therapy that includes interoceptive exposure, where you deliberately provoke mild versions of feared body sensations in a safe setting, has shown strong results. In a randomized trial, patients who received this type of exposure therapy had fewer panic attacks and better overall functioning at both the end of treatment and at six-month follow-up compared to those who received breathing retraining instead.21PubMed Central. Interoceptive exposure versus breathing retraining within cognitive-behavioural therapy for panic disorder with agoraphobia The logic makes sense once you understand the catastrophic-misinterpretation cycle: by learning that a racing heart or dizziness is not dangerous, you weaken the feedback loop that turns normal body sensations into full-blown panic.
How Culture Shapes What an Attack Feels Like
Panic attacks are not experienced identically across all populations. A study using three major national epidemiological databases in the United States found that white Americans reported higher rates of panic disorder and many individual panic symptoms, including palpitations, compared to African American, Asian, and Latino groups.22PubMed Central. Panic disorder, panic attacks and panic attack symptoms across race-ethnic groups: results of the collaborative psychiatric epidemiology studies A separate study with a student sample found that overall rates of panic symptoms were similar across racial groups, but the specific symptoms people endorsed differed. Participants identifying as Asian reported higher rates of dizziness, choking, and feeling terrified, while African American participants reported feeling less nervous compared to white participants during similar episodes.23PubMed Central. The experience of panic symptoms across racial groups in a student sample
This matters practically. If you are searching online for “symptoms of an anxiety attack” and the list you find emphasizes certain sensations over others, you might not recognize your own experience. Someone whose attacks present primarily as dizziness and a choking sensation, with less of the classic “nervous” feeling, might conclude that what happened was something other than panic. Awareness that the symptom profile varies can help you identify your own episodes more accurately and describe them more clearly to a clinician.
The Vestibular Connection
One of the more overlooked overlaps in panic disorder involves the inner ear. If your main symptom during an episode is dizziness or a sense that the room is tilting, it might not be “just anxiety.” Rates of panic disorder among people who seek medical care for dizziness are five to fifteen times higher than in the general population.5PubMed. Dizziness and panic disorder: a review of the association between vestibular dysfunction and anxiety And the relationship appears to run both directions: panic disorder patients with chronic dizziness showed significantly higher rates of measurable vestibular abnormalities compared to people who had dizziness alone.24PubMed Central. Vestibular testing in patients with panic disorder and chronic dizziness
Several theories try to explain this connection, ranging from the idea that vestibular dysfunction triggers panic through false alarm signals in the brain to the possibility that the brain areas involved in balance processing and threat detection share enough wiring that dysfunction in one destabilizes the other. For someone trying to figure out what happened during a scary episode, the practical implication is that persistent dizziness alongside panic symptoms is worth evaluating with a vestibular exam, not just anxiety treatment. If an underlying inner-ear issue is contributing, treating it can reduce the frequency and severity of the attacks themselves.