Body Language Cues That Signal Danger (and How to Send Your Own Safe Signals)
Piloerection (Goosebumps): The Physiological Threat Response

Piloerection, commonly known as goosebumps, is a fascinating and often overlooked physiological response that can signal a primal threat. This involuntary reaction is an archaic survival mechanism that causes hair to stand on end, making an animal appear larger to a predator. In humans, it can be a subtle yet telling sign of a sudden adrenaline rush, indicating a state of fear, excitement, or impending aggression. While not always a sign of danger, its sudden appearance can be an important cue to pay attention to a person's emotional state or the environment they're reacting to.
Microexpressions: The Blink-and-You-Miss-It Truths

Microexpressions are fleeting facial expressions that last only a fraction of a second, often revealing a person's true, suppressed emotions. They are involuntary and cannot be faked or controlled. For example, a quick flash of anger might be revealed by a tightened lip or a furrowed brow, even if the person immediately replaces it with a calm smile. Becoming adept at spotting these blink-and-you-miss-it cues can give you an invaluable advantage in understanding a person's genuine emotional state, allowing you to gauge their true intentions and react accordingly.