A panic attack arrives without warning and drains away on its own. The first one usually ends in an emergency department, with the patient certain something is wrong with their heart. It almost never is, though only a doctor can make that call. Knowing the shape of an attack takes some of the terror out of the next one.
What one feels like

The symptoms land in the body first. The heart pounds or races. Breathing turns shallow and fast. The hands tingle or go numb, the chest tightens, and dizziness rolls in. Some attacks bring sweating, trembling, nausea, or hot flushes. Many carry a sense of unreality: the room feels a step away or slightly fake, sensations clinicians label derealization and depersonalization. The medical name for the whole episode is a panic attack, a sudden surge of intense fear packed with physical symptoms.
What makes it so frightening is how physical it feels. Tingling hands and chest tightness read like a heart attack or a stroke, and fearing that feeds the next wave. The loop has a name in the clinic: fear of fear.
The ten-minute arc

Most attacks follow one curve. The symptoms surge to a peak within about 10 minutes, then decline across the next twenty or so. A tail of exhaustion, jitteriness, or a churning stomach can last hours afterward.
What’s happening underneath is the fight-or-flight response firing in the absence of a threat. Adrenaline floods the bloodstream, the heart beats faster and harder, and breathing speeds up to push oxygen toward muscles that aren’t going anywhere. Fast breathing also lowers carbon dioxide in the blood, which produces the very dizziness and tingling that send people to the emergency department. The alarm system is working as designed. It’s simply responding to the wrong signal.
During an attack

Lengthen the exhale. Breathe in through the nose for about four counts and out for six or seven. A longer exhale nudges the nervous system toward calm. Fast, deep breaths make the tingling worse, so slow beats big.
Ground the senses. Press the feet flat into the floor and name five things in the room: a lamp, a crack in the ceiling, the sound of traffic. Attention pulled back to the present gives the alarm less to work with.
Name the sensations. Saying “this is a panic attack, it peaks in ten minutes, it passes” keeps the thinking brain online. Describing symptoms in plain words (“my heart is racing, my hands are tingling”) shrinks the sense that something unexplainable is happening.
After an attack
An attack leaves people drained and watchful for the next one. Three things lower the odds of a repeat.
Caffeine deserves a hard look. It speeds the heart and mimics the exact sensations of an attack, so a strong coffee habit can feel like a panic habit. Cutting back, or half-caf after noon, removes one trigger.
Sleep is the second lever. A tired nervous system misreads ordinary signals more easily, and panic thrives on that misreading. A regular bedtime beats any single coping trick.
The third is treatment. Cognitive behavioral therapy (CBT) is the best-studied approach for panic: it brings on the feared sensations safely (a spinning chair for dizziness, a straw for shortness of breath) until the brain relearns that they pass. Medication helps some people, and a GP or psychiatrist can talk through the options. The National Institute of Mental Health sets out evaluation and treatment routes for panic and related anxiety conditions.
Panic disorder vs occasional attacks
A single attack can hit anyone: after a shock, during an illness, in a week of broken sleep. Panic disorder starts when the attacks recur and a month or more goes into fearing the next one or avoiding places that might bring one on, such as bridges, queues, or crowded shops. The avoidance shrinks a life quickly and responds to treatment, usually CBT with a therapist who knows the condition.
When to see a doctor
Book a visit after a first attack, even if it passed cleanly. A doctor can rule out the conditions that mimic panic: heart rhythm problems, thyroid trouble, asthma, low blood sugar. Go to emergency care, or see a doctor sooner, with chest pain during an attack, fainting, weakness or slurred speech, symptoms that don’t settle after half an hour, or a racing heart between attacks.
One practical note for the next episode: panic peaks in minutes and passes every time. The body’s alarm is loud and wrong, and treatment makes the episodes rarer.