Catecholamines are a group of hormones produced by the adrenal glands, which are located on top of the kidneys. The main catecholamines include epinephrine, norepinephrine, and dopamine. These hormones play a crucial role in the body's response to stress, often referred to as the "fight or flight" response, by increasing heart rate, blood pressure, and energy availability. Catecholamines are released into the bloodstream during stressful situations, helping to prepare the body for quick action. They also influence various bodily functions, including metabolism and mood regulation. Imbalances in catecholamine levels can be associated with conditions such as anxiety, depression, and hypertension.