Noradrenaline, also known as norepinephrine, is a hormone and neurotransmitter produced in the adrenal glands and certain neurons in the brain. It plays a crucial role in the body's response to stress, helping to regulate blood pressure, heart rate, and blood flow. When released, noradrenaline prepares the body for "fight or flight" situations by increasing alertness and energy levels. In addition to its role in stress response, noradrenaline is involved in mood regulation and cognitive functions. Imbalances in noradrenaline levels have been linked to various mental health conditions, including depression and anxiety disorders. Medications that affect noradrenaline levels are often used to treat these conditions.