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Why telling an anxious person there’s nothing to worry about rarely helps, what the brain is actually tracking, and one technique you can practise on your own.
Anyone who has sat with an anxious friend knows how it goes. You tell them it’s fine, that nothing bad is going to happen. They nod. Five minutes later the worry is back, unchanged.
That isn’t stubbornness, and it isn’t a failure to listen. The reassurance is aimed at the wrong thing.
Fear and anxiety feel similar from the inside, but they run on different structures. The amygdala fires when something specific happens, and then it quiets down. A neighbouring structure, the bed nucleus of the stria terminalis — BNST for short — behaves differently. It stays switched on through the whole stretch when a person doesn’t know when something is coming.
Researchers have watched both at once. At the moment a warning cue appeared, the amygdala spiked. Through the waiting that followed, the BNST stayed active instead (Herrmann et al., 2015).
The clearest demonstration uses mild electric shocks across two rounds. In the first, a cue warns people each time. In the second, the shocks arrive at random. The shocks are identical. All that changes is whether a person can see them coming.
What gets measured is the startle reflex: the involuntary blink when a loud noise hits. Electrodes on the face pick up how hard the eyelid muscle fires. Nobody can talk themselves out of it or fake it.
In the warned round, the reflex jumps at the cue, then settles back down. In the random round, it stays elevated the entire time, including the long gaps when nothing at all is happening (Grillon, 2002).
Reassurance lowers how dangerous something sounds. It never says when. If the system driving the feeling is tracking uncertainty, lowering the danger estimate doesn’t reach it.
It also explains something people notice in themselves. Waiting for a test result is often harder than the result, and even a bad answer can land as relief.
The treatments that work go at the uncertainty itself rather than the content of any particular worry. In one trial of 126 adults with generalized anxiety, 80 percent of those who received a therapy built around tolerating uncertainty no longer met criteria for the disorder afterward (van der Heiden et al., 2012).
One piece of that work can be practised alone. Give worry an appointment. Pick a set time each day — say six o’clock — and give it fifteen minutes. When a worry turns up before then, write one line about what it was and leave it for six. At six, sit down and worry on purpose for the full fifteen.
What does the work is something a person notices after a few days: the worry waited. Something that felt impossible to put down turned out to be something they could put down. In one trial, adults with generalized anxiety practised this over six days. Their worry dropped, and it still held a month later (Krzikalla et al., 2024).
Worry that keeps a person from sleeping, working, or being with the people they care about is worth a proper look from a licensed clinician.
Prefer to watch? The short is above, or watch it on YouTube.
Educational information only, not medical advice. If you are in crisis, call or text 988.
