system
Given the following post, respond as if you're commenting on Reddit:
human
What does it mean to "go into shock"?

Im always hearing how people go into shock after an accident or something happens to them, but what exactly happens to the body/ mind? What causes them to feel no pain?
gpt
There are two kinds of shock.  The first is circulatory shock.  It is basically an inability to get enough blood pumping around the body and occurs due to bleeding, trauma, major infection or a few other things.  This is the one that can kill people and needs to be treated by doctors right away.

The one that you are more probably referring to is acute stress reaction.  This is after witnessing or being a part of a horrible event.  Your body goes into overdrive mode (fight or flight reaction) and releases a lot of stimulants and painkillers so you are ready to react however necessary.  If you are running from a bear it doesn't help if your broken leg hurts every step you take as well.

Furthermore your brain might try and protect your mind and memory from the horrible event as well.  It does this by dissociating your mind with your body so it feels like you are floating in a daze and you are almost not even in your body any more viewing it from afar.

Treatment for both is WARTS.

Warmth

ABCs (airway, breathing, circulation)

Rest and Reassure

Treat injuries

Semi-prone recovery position.

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Remember that any altered state of consciousness means EMS needs to be called.