An increase in cortisol, a stress hormone, can cause physical and psychological symptoms such as:

Physical symptoms:
    Increased heart rate
    High blood pressure
    Muscle tension and weakness
    Headaches
    Fatigue
Psychological symptoms:
    Anxiety
    Irritability
    Mood swings
    Decreased concentration
    Insomnia or disturbed sleep

How increases in cortisol feels in your body is entirely subjective, as the experience of stress and its physiological effects can vary greatly from person to person.
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