A panic attack is a sudden surge of intense fear that triggers severe physical symptoms, even when there’s no actual danger. It peaks within about 10 minutes and usually lasts 5 to 20 minutes total. But because the symptoms overlap so heavily with heart attacks, blood sugar drops, and other medical events, the question “is this a panic attack or something else?” is one of the most common reasons people end up in emergency rooms. Here’s how to tell the difference.
What a Panic Attack Actually Feels Like
A panic attack hits fast. One moment you’re fine, and the next you’re flooded with a combination of physical and psychological symptoms that feel overwhelming. Clinically, a panic attack requires at least four of the following symptoms happening at once: a pounding or racing heart, sweating, trembling, shortness of breath, a choking sensation, chest pain, nausea, dizziness or lightheadedness, chills or sudden heat, numbness or tingling, a feeling that the world isn’t real or that you’re detached from yourself, fear of losing control, or fear of dying.
That last one matters. Many people in the middle of a panic attack are genuinely convinced they’re dying. That conviction isn’t a sign of weakness or exaggeration. It’s part of the event itself. Your brain’s threat-detection system has misfired, flooding your body with adrenaline and norepinephrine as if you were being chased by a predator. Your heart rate spikes, your breathing accelerates, and your muscles tense, all in service of a danger that doesn’t exist. The symptoms are real. The emergency is not.
About 2.7% of U.S. adults experience panic disorder in any given year, but isolated panic attacks are far more common than that. Many people have one or two in their lifetime without ever developing a recurring pattern.
Panic Attack vs. Heart Attack
This is the comparison most people are really asking about when they search this question. Both involve chest pain, shortness of breath, and a sense that something is terribly wrong. But there are meaningful differences in how they unfold.
A panic attack typically comes on suddenly and reaches its worst point within about 10 minutes. A heart attack, on the other hand, usually starts slowly. Most begin with mild pain or pressure that gradually worsens over several minutes, and these episodes can come and go several times before the full event occurs. Panic attack chest pain often feels sharp or stabbing and tends to stay in one spot, while heart attack chest pain is more commonly described as a squeezing pressure that can radiate into the arm, jaw, or back.
Physical exertion is another useful signal. Panic attack symptoms don’t get worse when you move around. Heart attack symptoms often do. Women experiencing a heart attack are also more likely to have symptoms that don’t include chest pain at all, such as nausea, back pain, or shortness of breath, which makes the overlap with panic even more confusing.
If your symptoms are new, if the chest pain feels different from anything you’ve experienced before, or if you have risk factors for heart disease, treat it as a potential cardiac event until proven otherwise.
Other Conditions That Mimic Panic Attacks
Heart problems aren’t the only medical issue that can look and feel like a panic attack. Several conditions produce nearly identical symptoms, and some of them require prompt treatment.
Low blood sugar (hypoglycemia). When your blood glucose drops, the resulting symptoms can include palpitations, anxiety, sweating, trembling, confusion, and irritability. If you’re diabetic or haven’t eaten in a long time, what feels like panic could be your body reacting to insufficient fuel. Eating something with sugar or carbohydrates will typically improve symptoms within 15 minutes if low blood sugar is the cause.
Heart rhythm problems. Arrhythmias, particularly a type of rapid heartbeat called supraventricular tachycardia, can cause a sudden pounding heart, dizziness, and chest discomfort that feels indistinguishable from a panic attack. These episodes can start and stop abruptly, adding to the confusion. One key difference: heart rhythm disorders can sometimes cause fainting, which panic attacks almost never do.
Blood clots in the lungs (pulmonary embolism). This is a life-threatening condition with no single characteristic symptom, which makes it particularly dangerous to overlook. The most common complaint is sudden shortness of breath, which can be mild or severe. Chest pain from a pulmonary embolism tends to be sharp and stabbing, often worse when you breathe in or cough, and frequently felt on one side. If your breathing difficulty came on suddenly and gets worse with physical effort, this possibility needs to be ruled out.
Overactive thyroid. An overactive thyroid gland speeds up many of your body’s processes, producing a racing heart, trembling, sweating, heat intolerance, and anxiety that can persist for weeks or months. The key distinction is duration. Panic attacks are episodic. Thyroid-related symptoms are more constant and gradually worsen over time.
Caffeine and Other Triggers
Sometimes the culprit isn’t a hidden medical condition but something you consumed. Caffeine is the most well-studied example. In research involving people with panic disorder, roughly 51% experienced a full panic attack after consuming caffeine at doses equivalent to about five cups of coffee, compared to fewer than 2% of people without the disorder. Even in healthy adults, high caffeine intake increases anxiety. If your episodes tend to follow heavy coffee or energy drink consumption, that connection is worth exploring.
Nicotine, certain decongestants, and stimulant medications can also trigger the same adrenaline-driven cascade that produces panic symptoms. So can intense exercise, sleep deprivation, and sudden temperature changes. Identifying your specific triggers won’t prevent every episode, but it can reduce their frequency significantly.
The Aftermath of a Panic Attack
Even after the acute symptoms pass, most people don’t snap back to normal immediately. The “panic attack hangover” is a real phenomenon that can include profound fatigue, brain fog, muscle soreness, body aches, and a lingering sense of unease. Your body just burned through a massive dump of adrenaline in a matter of minutes, and it needs time to recover.
For most people, this recovery period lasts a few hours to a day. In some cases, fatigue and emotional sensitivity can linger for up to a week. This doesn’t mean something else is wrong. It means your nervous system is recalibrating after an intense event. Rest, hydration, and gentle movement tend to help more than trying to push through it.
When to Get Evaluated
If you’ve never had a panic attack before and you’re experiencing a racing heart, chest pain, dizziness, or shortness of breath for the first time, go to the emergency room. There’s no reliable way to self-diagnose the difference between a panic attack and a cardiac event during your first episode. Emergency physicians expect and welcome these visits.
Even if you’ve had panic attacks before, seek immediate care if your symptoms feel different this time, if you faint or nearly faint, if your chest pain radiates into your arm or jaw, or if your shortness of breath gets worse with physical activity rather than better. The cost of checking on a panic attack that turns out to be harmless is always lower than the cost of ignoring a medical emergency.
Once serious conditions have been ruled out, a proper evaluation for panic disorder is worthwhile if you’re having recurring episodes. Panic attacks respond well to treatment, and most people see significant improvement within weeks of starting. Living with frequent, untreated panic attacks isn’t something you need to accept as normal.