Most panic attacks, while terrifying, do not require emergency care. They typically peak within 10 minutes and resolve on their own within 20 to 30 minutes. But some symptoms that feel like a panic attack can signal a heart attack, a blood clot in the lungs, or another life-threatening condition. The challenge is telling the difference in the moment, and there are specific signs that should push you toward calling 911 rather than trying to ride it out.
Symptoms That Warrant a 911 Call
Certain symptoms overlap between panic attacks and medical emergencies, but a few red flags point strongly toward something physical. Go to the ER or call 911 if you experience any of the following during what feels like a panic attack:
- Pressure, squeezing, or heaviness in your chest that doesn’t let up. Panic attacks tend to cause sharp, stabbing chest pain. Heart attacks more often feel like something is sitting on your chest or squeezing it. Many heart attack patients don’t even call it “pain.” They call it discomfort.
- Pain or discomfort spreading to your arm, jaw, neck, or throat. This radiation pattern is a hallmark of cardiac events and almost never happens during a panic attack.
- Fainting or loss of consciousness. Panic attacks can make you feel like you’re going to faint, but actually passing out is uncommon. If you do faint, you need immediate medical evaluation regardless of the suspected cause.
- Symptoms that last longer than 30 minutes without improving. A panic attack is self-limiting. A heart attack will not resolve on its own and typically gets worse or stays constant until treated.
- Sudden shortness of breath that came out of nowhere without any emotional trigger, especially if you’ve recently been immobilized (long flight, surgery, broken bone, bed rest). This pattern can indicate a pulmonary embolism, which is a blood clot in the lungs.
If you’re genuinely unsure, go. Emergency departments are equipped to rule out cardiac and pulmonary problems quickly, and no one will judge you for coming in with chest pain that turns out to be anxiety. That’s a routine part of ER work.
How Panic Attacks Differ From Heart Attacks
The overlap between these two is real, which is why so many people with panic attacks end up in the ER. Both can cause chest pain, shortness of breath, sweating, nausea, and a sense of doom. But several patterns help distinguish them.
Panic attacks usually have a trigger, even if it’s not immediately obvious. You were stressed, in a crowded space, thinking about something distressing, or already feeling anxious. Heart attacks tend to come out of the blue with no emotional precipitant. Panic attacks also produce a sharp, intense, dramatic pain, often accompanied by a racing or pounding heart. Heart attacks feel more like dull pressure or tightness, and patients frequently underestimate them because the sensation isn’t as dramatic as they expected.
Duration is another key difference. A panic attack will run its course, usually within minutes, and your symptoms will start to ease as your body calms down. A heart attack does not get better with deep breathing or calming techniques. The discomfort persists or worsens until you receive medical treatment, and it can last for hours.
Women Face a Higher Risk of Misreading Symptoms
Women are more likely to experience heart attacks with atypical symptoms that look nothing like the classic chest-clutching scene from movies. Research published in the Journal of Mid-Life Health found that roughly 85% of women who had heart attacks presented with atypical symptoms: dizziness, sweating, shortness of breath, nausea, vomiting, back pain, palpitations, or fatigue. Many had no chest pain at all.
These symptoms overlap heavily with panic attacks, which means women with anxiety disorders are at particular risk of dismissing a cardiac event as “just another panic attack.” If you’re a woman experiencing unusual shortness of breath, sudden sweating, nausea, or back pain, especially if the pattern feels different from your typical panic episodes, treat it as a medical emergency until proven otherwise.
When a “First Panic Attack” Might Not Be One
If you’ve never had a panic attack before and suddenly develop one, be cautious about self-diagnosing. Several medical conditions can mimic panic attack symptoms convincingly: an overactive thyroid, heart rhythm abnormalities, low blood sugar, and pulmonary embolism are among the most common culprits. A first-time episode deserves medical evaluation, either in the ER if symptoms are severe, or with your doctor promptly if symptoms have resolved.
One particularly dangerous mimic is a pulmonary embolism. A case series in a 2023 medical report described patients whose blood clots in the lungs were initially mistaken for panic disorder, with fatal consequences in some cases. The key warning sign: a new pattern of breathlessness that doesn’t match previous anxiety episodes, particularly following a period of immobility like recovery from surgery, a leg injury, or a long trip. About one-third of pulmonary embolism patients also have visible swelling, warmth, or pain in one calf from an underlying blood clot in the leg.
What Happens if You Go to the ER
If you show up to the ER with chest pain and anxiety symptoms, the staff will not simply tell you it’s a panic attack and send you home. The standard evaluation starts with an electrocardiogram (a quick, painless heart tracing) and blood tests that detect proteins released by damaged heart muscle. These blood markers are highly sensitive and can rule out a heart attack within hours, sometimes faster with newer testing methods. You may also have your oxygen levels checked and, depending on your symptoms, imaging of your chest or lungs.
This process typically takes a few hours. If all tests come back normal, that’s genuinely reassuring. It means your heart and lungs are fine, and you can move forward knowing the episode was almost certainly anxiety-related. Many people find that having cardiac problems definitively ruled out actually reduces the severity of future panic attacks, because the fear of “what if this is my heart” loses its grip.
After the ER: What Comes Next
If you’re discharged with a diagnosis of panic attack, the ER visit isn’t the end of the story. It’s worth following up with your primary care doctor to screen for underlying conditions like thyroid problems or heart rhythm issues that can fuel panic symptoms. A consistently elevated resting heart rate above 100 beats per minute, for example, deserves investigation beyond an anxiety diagnosis.
Recurrent panic attacks that send you to the ER multiple times are a sign that you’d benefit from treatment for panic disorder itself. Panic disorder responds well to both therapy and medication, and effective treatment dramatically reduces ER visits. Cognitive behavioral therapy, in particular, has strong evidence for breaking the cycle of panic, where fear of the next attack actually triggers more attacks.
If you’re discharged from the ER, ask for a clear plan: what symptoms should bring you back, who to follow up with, and what to do if another episode happens at 2 a.m. Having that plan written down can itself be a tool against panic, giving you a concrete protocol instead of spiraling uncertainty.