Why do we sweat when we're anxious? © Getty Images

Why do we sweat when we’re anxious?

Some say it could be a warning for others to stay sharp.

Asked by: Kanika Ahuja, Winchester

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This is part of our fight-or-flight response and happens when our sympathetic nervous system releases hormones, including adrenaline, which activates sweat glands. Brain scans reveal that sniffing someone else’s panic-induced sweat lights up regions of the brain that handle emotional and social signals. So one theory is that this sweating is an evolved behaviour that makes others’ brains more alert and primed for whatever it is that’s making us anxious – handy if there’s a marauding tiger on the loose.

Smart tattoo harvests energy from your sweat © Getty Images

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