Because it thinks you are in danger. When a message lands wrong, an attachment-wired brain does not file it as social information. It files it as threat, and the body responds accordingly: heart rate climbs, stress hormones release, and thinking narrows to the source of the threat, which is the phone in your hand. Researchers call this state flooding, and once you are in it, the reasoning parts of your brain are running on backup power.
The send button promises relief, and the promise is not entirely false. A sharp text usually does get a reaction, and a reaction feels like contact, and contact is what the alarm wants. That is the trade your nervous system is offering: thirty seconds of relief now, paid for with a fight tonight and a repair job tomorrow. Urgency is a symptom of arousal. It is not evidence that the message is true, fair, or due.
