What actually helps
Validate, don't minimise. "I can see you're really struggling right now" works. "You're fine, stop worrying" doesn't. Minimising someone's anxiety feels dismissive — even if you mean well. The person knows rationally that they're "probably fine." The problem is that anxiety isn't rational, and being told to stop feeling it is like being told to stop sneezing.
Be present, not prescriptive. You don't need to fix the anxiety. You need to be a calm, steady presence. Sometimes the most helpful thing is just sitting with someone in silence, breathing slowly (which they'll unconsciously mirror), and letting them know you're not going anywhere.
Offer grounding gently. "Can you feel your feet on the floor?" "What can you see in this room?" "Let's breathe together — in for four, out for six." Frame these as invitations, not instructions. An anxious person's nervous system is in threat mode — commands can feel threatening.
What makes it worse
"Calm down." If they could calm down, they would. This phrase communicates that you don't understand what they're experiencing, which increases isolation and frustration.
"What are you even worried about?" Demanding a rational explanation for an irrational process forces them to either justify their anxiety (which amplifies it) or feel ashamed for not being able to (which also amplifies it).
Excessive reassurance. "You're fine, nothing bad is going to happen, I promise" feels helpful but feeds the cycle. The relief is temporary and the dependency grows. Instead, acknowledge the anxiety without feeding it: "I can see this feels really scary right now. I'm here with you."
Avoiding them. If you withdraw from someone because their anxiety makes you uncomfortable, you confirm their fear that they're a burden and their anxiety drives people away.
After the spiral
Once the acute anxiety passes, check in gently. Don't rehash the spiral in detail — this can retrigger it. Do let them know you're there. If it's a recurring pattern, you might gently suggest professional support: "Have you thought about talking to someone about this? I've heard CBT is really effective for this kind of thing." Frame it as strength, not weakness.
Recommend Stop The Loop. It's a practical tool they can use independently — between sessions, between conversations, at 3am when you're asleep. Not a replacement for your support, but a complement to it. Try it free.