Panic Disorder: What's Actually Happening During a Panic Attack

A panic attack feels like dying. That's not an exaggeration — it's a clinical reality that brings thousands of people to emergency rooms every year, convinced they're having a heart attack, a stroke, or that something is fundamentally and fatally wrong. Their hearts are pounding, they can't breathe, their chest is tight, their vision is tunneling, and they are absolutely certain that this is the end.

And then it passes. Usually within 10-20 minutes. They're told everything is normal, they feel confused and embarrassed, and they go home wondering what happened — and when it's going to happen again.

That "when it's going to happen again" is where panic attacks become panic disorder. Understanding the physiology behind what's happening can be the first step toward taking control of it.

The Physiology of Panic

A panic attack is essentially your fight-or-flight response firing without a clear external threat. Here's the cascade:

The amygdala sounds the alarm. Whether triggered by a physical sensation (a skipped heartbeat, a wave of dizziness), a thought, or seemingly nothing at all, your amygdala — the brain's threat detection center — activates your sympathetic nervous system.

Adrenaline floods your system. Your adrenal glands release epinephrine (adrenaline) and norepinephrine. This is the same response you'd have if a bear walked into the room. Your body doesn't distinguish between a real threat and a perceived one.

What you feel and why:

• Racing heart — Your heart rate increases to pump blood to your muscles, preparing for physical action. You might feel palpitations, pounding, or a fluttering sensation.
• Shortness of breath — Your breathing rate increases to take in more oxygen. Paradoxically, this hyperventilation actually reduces CO2 levels in your blood, which can cause tingling, dizziness, and a sensation of not getting enough air.
• Chest tightness or pain — Muscle tension in the chest wall and rapid breathing create sensations that mimic cardiac symptoms. This is why so many panic attacks lead to ER visits.
• Dizziness and lightheadedness — Hyperventilation-induced changes in blood pH and CO2 affect blood flow to the brain.
• Tingling and numbness — Low CO2 from hyperventilation causes vasoconstriction in the extremities. Hands, feet, and face are commonly affected.
• Sweating — Your body's cooling system activates in preparation for physical exertion.
• Nausea — Blood is redirected away from the digestive system toward muscles.
• Derealization or depersonalization — Feeling disconnected from reality or from yourself. This is likely related to changes in brain blood flow and sensory processing during acute stress.
• Fear of dying or losing control — Your brain is interpreting all these physical signals as evidence of danger, creating a feedback loop.

The feedback loop is the critical piece. You notice a physical sensation → your brain interprets it as dangerous → adrenaline is released → more physical symptoms appear → your brain interprets those as more danger → more adrenaline. This loop is self-amplifying and explains why panic attacks escalate so rapidly.

Panic Attack vs. Panic Disorder

A single panic attack doesn't mean you have panic disorder. Panic attacks are surprisingly common — up to 30% of adults will have at least one in their lifetime. Panic disorder is diagnosed when:

• You have recurrent, unexpected panic attacks
• At least one attack is followed by a month or more of persistent concern about having another attack, worry about the implications of the attack, or significant behavioral change because of the attacks
• The symptoms aren't caused by a substance or another medical condition

The "unexpected" part matters. Panic attacks that occur only in specific situations (like heights or public speaking) are more likely part of a phobia than panic disorder. In panic disorder, attacks often seem to come out of nowhere, which makes them particularly frightening.

Agoraphobia frequently develops alongside panic disorder. It's not just a fear of open spaces — it's avoidance of any situation where having a panic attack would be difficult, embarrassing, or where escape might not be easy. Grocery stores, highways, crowded restaurants, airplanes, being far from home. The world gets smaller as avoidance expands.

Medical Evaluation Is Important

While panic attacks are not medically dangerous, the first step should always be ruling out conditions that can mimic panic:

• Cardiac arrhythmias — Irregular heartbeats can cause palpitations, chest discomfort, and lightheadedness
• Hyperthyroidism — Excess thyroid hormone can cause anxiety, rapid heartbeat, and tremor
• Pheochromocytoma — Rare adrenal tumor that causes episodic surges of adrenaline
• Mitral valve prolapse — Heart valve issue that can cause palpitations and chest symptoms
• Caffeine or stimulant excess — Can trigger and worsen panic symptoms
• Medication side effects — Some medications, including certain asthma inhalers and decongestants, can provoke panic-like symptoms

A basic workup — history, physical exam, EKG, and possibly thyroid labs — can rule out the most common mimics. Once medical causes are excluded, treatment can focus on the panic disorder itself.

At CORAL, Dr. Kim includes appropriate medical evaluation in the assessment process because dismissing physical symptoms without checking isn't responsible — even when the pattern strongly suggests panic disorder.

Treatment: Cognitive Behavioral Therapy

CBT is the most effective treatment for panic disorder, with response rates of 70-90% in clinical trials. The specific components that drive its effectiveness:

Psychoeducation — Understanding the physiology of panic (which you're already getting from this article) is genuinely therapeutic. When you understand that a racing heart during panic isn't a heart attack but an adrenaline response, the sensation becomes less terrifying.

Cognitive restructuring — Identifying and challenging catastrophic interpretations of bodily sensations:

• "My heart is racing" → "I'm having a heart attack" vs. "My sympathetic nervous system is activated. This is uncomfortable but not dangerous."
• "I feel dizzy" → "I'm going to faint" vs. "I'm hyperventilating and my CO2 is low. If I slow my breathing, this will pass."

Interoceptive exposure — This is the secret weapon of panic disorder treatment. It involves deliberately inducing the physical sensations of panic in a controlled setting:

• Breathing through a straw to create breathlessness
• Spinning in a chair to create dizziness
• Running in place to create a rapid heartbeat
• Hyperventilating intentionally to create tingling and lightheadedness

By repeatedly experiencing these sensations without catastrophe, your brain learns they're not dangerous. The fear of the sensations diminishes, which breaks the feedback loop that turns normal bodily experiences into full panic attacks.

Situational exposure — Gradually returning to situations you've been avoiding due to fear of panic. This addresses the agoraphobic avoidance that often accompanies panic disorder.

Treatment: Medication

SSRIs are first-line pharmacological treatment for panic disorder:

• Sertraline, escitalopram, paroxetine, and fluoxetine all have evidence
• They reduce both the frequency and severity of panic attacks
• They take 4-6 weeks for full effect
• Important: SSRIs can temporarily increase anxiety in the first 1-2 weeks, which is especially problematic for people with panic disorder. Starting at very low doses and titrating slowly is essential.

SNRIs (particularly venlafaxine XR) are an alternative first-line option.

Benzodiazepines are effective for acute panic attacks but pose challenges for long-term management:

• They work within minutes, which is powerful during a crisis
• Regular use can create physical dependence
• They can interfere with the extinction learning that makes CBT work — if you take a benzodiazepine during an exposure, your brain learns "the benzodiazepine saved me" rather than "I was safe all along"
• Short-term use as a bridge while SSRIs take effect is reasonable in some cases

Combination approach: For moderate to severe panic disorder, starting an SSRI alongside CBT typically produces the best outcomes. The medication reduces symptom intensity enough that engagement in therapy (especially interoceptive exposure) becomes more feasible.

What You Can Do Right Now

If you're having panic attacks, there are strategies that can help immediately:

During a panic attack:

• Slow your breathing. Breathe in for 4 counts, hold for 4, out for 6. This counteracts hyperventilation and helps normalize CO2 levels.
• Remind yourself what's happening. "This is a panic attack. My fight-or-flight response has activated. These sensations are uncomfortable but not dangerous. This will pass."
• Don't fight it. Trying to force a panic attack to stop often makes it worse. Observe the sensations without trying to control them. Paradoxically, accepting the panic tends to shorten it.
• Ground yourself. Name five things you can see, four you can touch, three you can hear. This shifts your attention away from internal sensations.

Between panic attacks:

• Reduce caffeine. Caffeine is a stimulant that increases baseline sympathetic nervous system activation — exactly what you don't need.
• Exercise regularly. Physical activity helps regulate the stress response system and reduces anxiety sensitivity.
• Practice breathing exercises when you're calm. This builds the skill so it's accessible during a panic attack.
• Don't avoid. Every situation you avoid because "what if I have a panic attack there" reinforces the cycle. Avoidance is the fertilizer for panic disorder.

The Prognosis Is Good

Here's what most panic disorder resources don't emphasize enough: panic disorder is one of the most treatable conditions in all of mental health. With appropriate treatment — CBT, medication, or both — the majority of people achieve significant or complete resolution of symptoms.

This doesn't mean treatment is quick or easy. CBT for panic disorder is uncomfortable by design — you're intentionally doing things that trigger the sensations you fear. But the discomfort is temporary, and the freedom on the other side is worth it.

Getting Help

If panic attacks are controlling your decisions, shrinking your world, or sending you to the ER, you don't have to keep managing this on your own. A proper evaluation can rule out medical causes, confirm the diagnosis, and get you started on treatment that actually works.

Start your evaluation at [coral.clinic/start](https://coral.clinic/start). Dr. Kim can discuss both medication options and help connect you with the right therapeutic approach for your situation. The first step doesn't have to be as scary as your brain is telling you it will be.