Pain is a universal feeling. Pain is described by the International Association for the Study of Pain as an unpleasant experience correlated with real or potential injuries or illnesses. Pain in clinical practice is categorized as anatomic, etiologic, intensity, duration, and pathophysiological classifications. Anatomic: Anatomic pain classification describes experienced pains in specific parts of the body. It is frequently used as a primary classification system to define the triggered points in the body. Etiologic: Etiologic pain classification describes the reason of pain. It can be subdivided into malignant or nonmalignant depending if it is cancerous or benignal. Intensity: Intensity pain classification is described by evaluating visual, numerical, rating, and descriptor scales. Duration: Duration classification describes the interval of time between the onset and the resolution.