When Your Heart Races and You Don’t Know Why: Panic Attacks, High Anxiety, and What Sets Them Apart
You are in a meeting, or on the sofa, or standing at the supermarket checkout. Nothing particularly difficult is happening. And then, without much warning, your heart slams against your ribs. Your hands go cold. You cannot quite get a full breath. The thought arrives — something is very wrong — and you do not know whether it is about the meeting, the day, your body, or something else entirely.
Later, when it passes, you find yourself wondering: was that a panic attack? Or just anxiety? And does the difference even matter?
It does. Not because one is more serious than the other, but because they ask something different of you — and understanding which is which helps make sense of what your body and mind are actually doing.
What High Anxiety Feels Like From the Inside
High anxiety is the experience of sustained, elevated threat-sensing — a state where the nervous system is continuously scanning for danger, even when the immediate situation doesn’t obviously warrant it. It often builds gradually. You might notice it as a low-level restlessness that has been present for days, a tightness in your chest that comes and goes, a quality of waiting for something bad to happen without knowing what.
The thoughts tend to loop. You replay conversations, rehearse future ones, check and re-check. Sleep might be shallow. You feel tired but wired — that particular combination that is hard to describe to someone who hasn’t felt it. The body is working hard, even at rest.
What makes high anxiety different from ordinary concern or alertness is its persistence. Appropriate worry tends to resolve once the situation resolves. With high anxiety, the signal stays on.
What a Panic Attack Actually Is
A panic attack is an acute, discrete episode — it arrives suddenly and peaks quickly, usually within ten minutes, and then subsides. It is not simply “very bad anxiety”, though anxiety can certainly trigger one. The experience is physiological and intense: racing or pounding heart, shortness of breath, dizziness, tingling in the hands or face, a profound sense that something is catastrophically wrong. Some people describe feeling detached from their body or from their surroundings. Some believe, in those minutes, that they are dying or losing their mind.
The reason this happens involves the body’s alarm system — the same one that helps you sprint from danger. In a panic attack, that system fires without an obvious external cause. From the perspective of polyvagal theory, it represents an extreme mobilisation response: the nervous system has interpreted something as an emergency and responded accordingly, even if the environment is objectively safe.
It is worth knowing that panic attacks can occur in the context of high anxiety — but they can also happen in people who do not otherwise consider themselves particularly anxious. They can even arrive during sleep.
Where Each Shows Up in Daily Life
Because high anxiety tends to be persistent rather than episodic, it shapes the texture of ordinary days in ways that can be harder to notice precisely because they become the background.
Relationships can feel effortful. You might find yourself over-thinking what you said, or bracing for conflict that hasn’t come. Work can feel like a constant performance review in your own head. The body — digestion, jaw tension, fatigue — carries a great deal.
Panic attacks, by contrast, tend to organise life around avoidance. If a panic attack happened on the motorway, driving becomes complicated. If it happened in a crowded room, social plans start to feel risky. This is one reason they deserve attention — not because the attacks themselves cause lasting physical harm, but because the fear of the next one can begin to quietly reduce your world.
For a fuller picture of how both show up, and how they overlap, the Anxiety & overwhelm page goes into more detail about the range of experiences that can sit under this umbrella.
Why It Matters to Know the Difference
This isn’t about categorising yourself or arriving at a neat diagnosis. It is more practical than that.
High anxiety and panic attacks sometimes call for different approaches in therapy. High anxiety often involves slowing down to examine what the nervous system has learnt to anticipate — frequently rooted in attachment experiences, in environments where watchfulness was genuinely necessary, in histories where rest felt unsafe. The therapeutic work tends to be gradual: building a different relationship with uncertainty, noticing the thoughts that feed the alarm system, and finding what it is like to let the body settle.
Panic attacks, because of their acute and frightening nature, often also need something more immediate: an understanding of what is happening in the body during an episode, and practice with ways of working with the nervous system in the moment rather than against it. Somatic approaches — attending to breath, sensation, and the felt sense of the body — can be particularly relevant here, alongside the slower, more reflective work.
What neither approach does is simply remove the anxiety, as if it were a nuisance with no meaning. In most cases, anxiety and panic have been doing something — signalling something, protecting something. Therapy is partly about being curious about what that might be.
A Small Reflection
If you have been living with either of these experiences, you will know that they are exhausting — not just in the acute moments, but in the ongoing work of managing around them, explaining them to people who don’t quite understand, wondering if this is simply how you are.
It is worth sitting with this: your nervous system is not broken. It is doing something it learnt to do, often for reasons that made complete sense at some point. The question is not what is wrong with you, but what your body has been carrying — and whether there is now room to carry it differently.
That is slow work. It does not follow a straight line. But it begins, usually, with someone sitting across from you and actually listening.