Pain is a complex sensation that serves as a warning signal to the body. It can arise from various sources, including injury, illness, or emotional distress. Pain is typically categorized into two main types: acute pain, which is short-term and often linked to a specific cause, and chronic pain, which persists over time and may not have a clear origin. The experience of pain involves both physical and psychological components. It is processed by the nervous system and can vary in intensity, duration, and quality. Factors such as stress, mood, and previous experiences can influence how pain is perceived and managed.