Nociception

Nociception (also nocioception or nociperception, from Latin nocere 'to harm or hurt') is the sensory nervous system's response to certain harmful or potentially harmful stimuli. In nociception, intense chemical (e.g., chilli powder in the eyes), mechanical (e.g., cutting, crushing) or thermal (heat and cold) stimulation of sensory nerve cells called nociceptors produces a signal that travels along a chain of nerve fibers via the spinal cord to the brain. Nociception triggers a variety of biological and behavioral responses and may also result in a subjective experience of pain in sentient beings.