During an anxiety attack, your body launches a full-scale stress response that can feel like a medical emergency. Your heart pounds, your breathing speeds up, your muscles tense, and your mind races with a sense that something is seriously wrong. The experience typically peaks within minutes and can last anywhere from a few minutes to half an hour, though the aftereffects often linger longer. Roughly 19% of U.S. adults experience an anxiety disorder in any given year, and these intense episodes are one of the most frightening symptoms people encounter.
What Your Brain Does During an Attack
The process starts in a small, almond-shaped region deep in your brain that processes emotions. When this area perceives a threat, whether real or imagined, it fires off a distress signal to the hypothalamus, which acts as a command center for the rest of your body. The hypothalamus communicates through your autonomic nervous system, the network that controls involuntary functions like breathing, heart rate, and blood pressure.
Within seconds, your adrenal glands pump adrenaline into your bloodstream. This is the same chemical surge you’d get if a car were speeding toward you. Your heart beats faster to push blood toward your muscles. Your breathing rate increases as the small airways in your lungs open wider to take in more oxygen. Your pupils dilate, your senses sharpen, and your brain goes on high alert. All of this happens automatically, without any conscious decision on your part.
If the stress signal continues, a second system kicks in: a hormonal chain reaction running from the hypothalamus to the pituitary gland to the adrenal glands. This keeps the “gas pedal” of your sympathetic nervous system pressed down, which is why an anxiety attack doesn’t just flash and disappear. It sustains itself, sometimes for 10 to 30 minutes, before your body’s calming system (the parasympathetic nervous system) gradually takes over.
What It Feels Like Physically
The physical symptoms of an anxiety attack are intense enough that many people go to the emergency room believing they’re having a heart attack. Common symptoms include:
- Rapid or pounding heartbeat, sometimes with a fluttering sensation in the chest
- Chest tightness or pain, caused by muscle tension and rapid breathing
- Hyperventilation, which can make you feel lightheaded or cause tingling in your fingers and lips
- Sweating and trembling, even in a cool room
- Nausea or stomach upset, because adrenaline diverts blood away from your digestive system
- Feeling weak or exhausted, as though your body just ran a sprint
- Shortness of breath, which can feel like you can’t get a full inhale no matter how hard you try
The chest pain and breathing difficulty are the symptoms most likely to convince you something is medically wrong. The chest tightness comes partly from the muscles between your ribs contracting and partly from the way rapid, shallow breathing changes the balance of oxygen and carbon dioxide in your blood. That same imbalance causes the tingling, dizziness, and feelings of unreality that often accompany an attack.
What Happens in Your Mind
The mental symptoms can be just as disorienting as the physical ones. Many people describe an overwhelming sense of impending doom, a conviction that something terrible is about to happen even when they can’t identify what. You might feel like you’re losing control of your thoughts or your body.
Some people experience depersonalization or derealization during an attack. Depersonalization feels like you’re watching yourself from outside your body, as if you’re floating above the situation or operating on autopilot. Derealization makes your surroundings seem unreal, flat, or dreamlike, as though you’re looking at the world through a glass wall. Objects might appear distorted in size or shape. Time can feel warped, with seconds stretching into what seems like minutes. These sensations are deeply unsettling, but they’re a known part of the stress response, not a sign that you’re “going crazy.” In fact, the worry about losing your mind is itself one of the most commonly reported cognitive symptoms during an attack.
You may also notice emotional numbness afterward, a strange disconnect from your own feelings or from people around you. Your memories of the attack can feel distant and stripped of emotion, almost like watching a scene that happened to someone else.
What Happens After the Attack Ends
Once the immediate surge passes, most people don’t snap back to normal. The hormone cascade that sustained the attack takes time to clear from your system. In the hours following an episode, you may feel physically drained, as though you’ve been through an intense workout. Brain fog, difficulty concentrating, and a general sense of heaviness are common. Some people feel emotionally flat or unusually sensitive for the rest of the day.
Muscle soreness is also possible. During the attack, your body tensed up in preparation for a physical threat that never came, and that sustained tension can leave your shoulders, jaw, neck, and back aching. Headaches are another frequent aftereffect, often triggered by the combination of muscle tension and changes in blood flow.
This “anxiety hangover” can last a few hours or stretch into the following day, depending on the intensity of the episode and how frequently you experience attacks. Sleep that night is often disrupted, either because residual adrenaline makes it hard to wind down or because the memory of the attack itself creates anticipatory anxiety.
How to Get Through One in the Moment
Grounding techniques work by pulling your attention away from the internal alarm and anchoring it to something concrete and present. One widely used method is the 5-4-3-2-1 technique: identify five things you can see, four you can touch, three you can hear, two you can smell, and one you can taste. This isn’t a distraction trick. It works by engaging the sensory processing parts of your brain, which helps short-circuit the stress response and nudge your nervous system back toward its calming mode.
Slow, deliberate breathing is the most direct tool you have. Because the autonomic nervous system controls breathing but you can also override it voluntarily, your breath is a bridge between the involuntary panic response and conscious control. Exhaling for longer than you inhale (for example, breathing in for four counts and out for six) activates the parasympathetic nervous system, which is the body’s built-in brake pedal. Even a few cycles of slow breathing can begin to lower your heart rate and reduce the intensity of symptoms.
Listening to music, petting a dog or cat, and holding something cold like an ice cube are all grounding strategies with some evidence behind them. Studies show that interacting with pets can measurably lower cortisol, the main stress hormone your body produces during prolonged anxiety. The key with any technique is to practice it outside of an attack so it becomes familiar enough to reach for when you’re in one.
What Frequent Attacks Do Over Time
A single anxiety attack, while frightening, doesn’t cause lasting physical harm. But when attacks become chronic, the repeated flood of stress hormones begins to take a measurable toll on the body. The cardiovascular system is particularly affected. Research published in the American Journal of Cardiology has linked anxiety disorders to both the development and progression of heart disease, including worse outcomes for people who already have cardiac conditions.
The mechanism involves several overlapping pathways. Chronic anxiety increases inflammation throughout the body, raising levels of the same inflammatory markers implicated in the buildup of arterial plaque. People with anxiety disorders also show impaired blood vessel function, meaning the vessels don’t dilate properly in response to blood flow, a sign of early cardiovascular damage. Platelet activity, the clotting process that can contribute to blocked arteries, is elevated in people with chronic anxiety. And heart rate variability, a measure of how well your body regulates its own stress response, is consistently lower in people with anxiety disorders. Lower heart rate variability is an independent risk factor for cardiac events.
None of this means a panic attack will give you a heart attack. It means that living with untreated anxiety over months or years creates a physiological environment that’s harder on your cardiovascular system than it needs to be. Treatment, whether through therapy, lifestyle changes, or medication, doesn’t just improve how you feel day to day. It reduces the chronic inflammatory and hormonal burden that drives long-term risk.