Tachykinins are a family of neuropeptides that play a crucial role in the nervous system. They are involved in various physiological processes, including pain perception, inflammation, and the regulation of mood. The most well-known tachykinin is substance P, which is primarily associated with transmitting pain signals. These peptides are produced in the body and act on specific receptors, known as tachykinin receptors. They are found in both the central and peripheral nervous systems, influencing functions such as smooth muscle contraction and neurotransmitter release. Research on tachykinins continues to explore their potential therapeutic applications in conditions like chronic pain and anxiety disorders.