The inner glands produce adrenaline. Adrenaline is also known as the “fight-or-flight hormone.” It's released in response to a stressful, exciting, dangerous, or threatening situation. Adrenaline helps your body react more quickly. One can reduce adrenaline by activating relaxation response ( in contrast of fight and flight response) by doing meditation, yoga, playing a sport, listening to music ect. One can do relaxation exercises like Jacobsons progressive muscular relaxation, pranayam and through guided imagery.