Bradykinin is a small protein that plays a crucial role in the body's inflammatory response. It is produced when certain proteins in the blood are activated, leading to increased blood flow and the dilation of blood vessels. This process helps deliver immune cells to areas of injury or infection, promoting healing. In addition to its role in inflammation, bradykinin can also cause pain and swelling. It interacts with specific receptors in the body, which can lead to sensations of discomfort. Understanding bradykinin is important for developing treatments for conditions like asthma and chronic pain.