Some common types of pain seen in primary care are visceral pain, somatic pain, radicular pain, referred pain, and neuropathic pain. Somatic pain arises from skin, bone, muscle, ligaments, and joints. It is sharp, well localized, stabbing or pricking-like, felt at the site of the pathology, Visceral pain is the pain originating from internal organs usually hollow viscera. The features are vague and not sharp like somatic pain, ill-localized, enhanced autonomic and/or motor reflexes (nausea, vomiting, and diaphoresis of heart attack), usually felt in the midline, pain may or may not be associated with relevant symptoms from the organ, referred pain. Referred pain is a typical feature of visceral pain. Examples of visceral referred pain include pain down the arm in cardiac ischemia, shoulder tip pain of gall bladder disease, and referred pain of renal colic. Visceral hypersensitivity or sensitization (may be important in clinical states like dysmenorrhea, IBS, non-ulcer dyspepsia, non-cardiac chronic chest pain) is the development of visceral hyperalgesia following injury or inflammation of a visceral organ. Neuropathic pain is characterized by ongoing pain (pain persisting after the neural stimulus stops, continuous or paroxysmal, shooting, shock-like, aching, cramping, crushing, smarting, burning, stabbing), evoked pain (stimulus-evoked pain, usually by mechanical, thermal, chemical, trigger points for mechanical stimuli, cold allodynia, evoked pains are brief, lasting for the period of stimulus application, but sometimes may persist after the cessation of the stimulus, pain may last from minutes to days), sensory deficit in the area of pain (essential criterion for the diagnosis but may not be clinically evident, cold, warmth and pinprick are the commonest deficits), hyperalgesia (lowering of pain threshold and an increased response to noxious stimuli), allodynia (pain elicit by non-noxious stimuli), hyperpathia (explosive response for pain stimuli).