Cortisol is the primary stress hormone. An increase in cortisol usually feels stressful or like getting "pumped up" for something. It increases your heart rate and raises blood glucose levels, and it causes blood to flow away from your stomach and into your brain and limbs, which causes the feeling of butterflies in your stomach. Things like realizing you are running late or forgetting an important event can all cause cortisol to increase. When cortisol spikes, your hands get clammy, your breathing quickens, and it can feel as though something bad is going to happen.
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