Pain is a complex sensory and emotional experience involving multiple pathways from peripheral detection to central perception. This chapter explores the pain pathway, starting from nociceptors in the periphery that detect mechanical, thermal, and chemical stimuli, progressing through transduction and transmission phases in the spinal cord, and culminating in perception within the brain. Neurotransmitters like glutamate and Substance P facilitate pain transmission, while inhibitory agents like GABA, norepinephrine, and endogenous opioids modulate and suppress these signals. The chapter also discusses critical elements in acute and chronic pain management, focusing on the modulation of neurotransmitter pathways to counteract pain sensitization. Additionally, classifications of pain types and mechanisms of peripheral and central sensitization are covered, highlighting recent therapeutic advancements aimed at targeting specific neurotransmitter pathways. This comprehensive view provides insights into potential treatment strategies for managing both acute and chronic pain conditions.