To Be Human Is to Tremble
by Dr. Silas Sheridan
Anxiety begins in your body, not your story. Before you can even put language to the feeling, your heart races and your muscles tense. Some cue, often subtle and outside your awareness, has registered as a threat, and your nervous system moves first. Your mind then hurries after, scrambling for a reason that matches what your body already believes. And once the alarm of anxiety sounds, your perception shifts with it. You search the world for danger: a pause, a glance, a flutter in your chest—any little detail can be recruited as evidence against you. But this is the mind doing what it evolved to do: predicting the world to keep you safe.
For most of human history, our nervy vigilance was lifesaving. We lived, after all, in a world where predators lurked and exile from the tribe was not symbolic, not a chance to find yourself, but often meant death. So we evolved to read subtle cues of tone, status and belonging with the same seriousness we once gave lions and snakes. But if this system is so vital, why does it so often turn against us? The answer is simple and a little bleak: it’s still solving ancient problems. We were not designed to be content and mellow creatures coasting through our days. Instead, we evolved in a world of scarcity, foes and uncertain alliances, and thus our uneasy inheritance.
And not all nervous systems are built the same. Some sound the alarm swiftly and loudly. Some can settle after the threat has passed, while others linger in that state of readiness, as if danger were still nearby. Temperament sets the baseline and is largely genetic. Of course life experience can amplify anxiety, but the baseline matters a great deal. Some people resist this biological view, preferring instead to see anxiety as a matter of mindset or a reasonable response to the grinding miseries of modern life (partly valid; I’ll write about that later) or as some kind of character defect. But twin studies and longitudinal research keep showing the same thing: variation in fearfulness and threat sensitivity runs deep in our genes. We can argue about the roles of culture and childhood, but the data are stubborn. Some nervous systems are simply built more reactive than others.
Sensitivity alone doesn’t explain why anxiety becomes so chronic for some and not for others. What turns a reactive nervous system into a way of life is not only how strongly we feel fear, but what we do when it arrives. This is crucial. Every time we retreat from discomfort, the nervous system logs the following lesson: Well done, you escaped. Danger confirmed. While relieving in the short term, avoidance doesn’t calm the alarm but only trains it to ring louder. And all the while your nervous system keeps a steady record of what you flee and what you face. It does not revise its predictions because you reassure it. It revises them only when its expectations fail. This is why so many well-meaning fads and fixes—breathing apps, affirmations, pep talks and every other gentle invitation to calm and positivity—fall short.
But the nervous system doesn’t really speak our modern language of optimism. It speaks the language of consequence. It wants to know what actually happens when the feared moment arrives. What helps is not the promise that nothing bad will happen, but the discovery that you can survive what happens inside you when it does. That the surge of fear will eventually crest. That the hour of your undoing will simply pass. And each time you stay with that discomfort and act anyway, the brain updates its forecast from “this is unbearable” to “this is awful and I’m still here.” Psychotherapy helps when it trades thin reassurance for real learning and repetition. The work is never the elimination of uncertainty (though admittedly that fantasy has sold a lot of books). It’s about learning to hold steady in its presence.
And beneath all this vigilance and trembling, there is something tender. Anxiety always seems to confess the same thing: I care. I want this to go well. I don’t want to be left behind. So as much as we might wish otherwise, a full life is not a certain one, and the tremble is often the cost of caring about anything at all.
To read this and other essays by Dr. Silas Sheridan follow him on Substack: https://behindthepattern.substack.com/p/to-be-human-is-to-tremble