These three terms sometimes get used interchangeably, but they're not quite the same — and understanding the differences can help.
Anxiety is the broadest of the three. It's a natural response to anticipated challenge, uncertainty, or possible threat. It can range from mild nervousness that helps you prepare to persistent worry, dread, or catastrophizing that interferes with your life.
Some anxiety fits the situation. Some doesn't. And sometimes a situation really is stressful, but your nervous system responds with far more alarm than the present circumstances require.
Panic is more acute — a sudden surge of intense fear or physical alarm that can include a racing heart, shortness of breath, dizziness, trembling, chest discomfort, and/or a frightening sense that something terrible is happening. Panic attacks typically intensify quickly and then subside, although the fear of having another one can itself become a source of anxiety.
Hypervigilance is less an episode than an ongoing pattern of heightened watchfulness. Your attention may automatically scan faces, voices, moods, situations, or your own body for signs that something might be wrong. It's exhausting precisely because the monitoring doesn't fully turn off.
These experiences can overlap. A person who is chronically hypervigilant may experience considerable anxiety and, at times, spikes of intense alarm or panic.
You can walk a calmer path when your nervous system no longer has to work so hard to protect you.