Adrenaline

Adrenaline, also known as epinephrine, is a stress hormone. Adrenaline, which is produced by the adrenal glands and released into the bloodstream, is a component of the "fight or flight" response. This hormone stimulates the nervous system in response to a perceived stressor or threat.
Assume you're riding your bike when a person appears out of nowhere, causing you to swerve. Adrenaline is produced by your body, resulting in an immediate physical reaction. You may perspire, feel your heart race, or shake. This is a normal, healthy reaction. Adrenaline can help you react quickly in a dangerous, unsafe, or problematic situation.

Characteristics
When adrenaline is released, you may experience:

• Elevated blood pressure
• Increased heart rate
• Heightened senses
• Decreased sensitivity to pain
• Enlarged pupils
• Shaky limbs
• Excessive sweating

When you're in a "fight-or-flight" situation, you may run faster than usual or feel no pain, even if you've been injured. This can occur when your body goes into survival mode.

This reaction can help keep you safe in dangerous, unsafe situations. Once the situation has changed and you are no longer under threat or under stress, your body will begin to calm down and the symptoms will go away.