1. acute pain. Acute pain is pain that is found at any time in everyday life, often occur with abrupt body since. Looks like a warning signal. This type of pain is often caused by tissue destruction, and there are severe pain in the first stage, and then will gradually decrease and will later go to be better treated, or cured itself without treatment, can predict what will be terminated in the future. By the duration of the pain for less than six months are most often found in patients with injuries. Surgery and procedures from various2. chronic pain Chronic pain is pain that occurs gradually and continuously remain at any time or may occur at any time. Pain continues slowly. Cannot predict whether or when to end a long term pain for more than 6 months. In spite of the attempt by all the way and then treatment. The pain is usually not wide area.Is limited to a specific location and can not tell this kind of pain usually makes depression patients suffering. The characteristics of the major chronic pain include:-Can not be cured. Pain will continue to remain in spite of the wounds and then disappear.-มักจะเกิดจากการที่เส้นประสาทถูกทำลาย -ไม่สามารถบอกสาเหตุและกลไกการเกิดความปวดได้ชัดเจน-ความปวดมีลักษณะผิดปกติ เช่น ความรู้สึกปวดคล้ายเข็มแทงซึ่งเกิดขึ้นเองโดยไม่มีสิ่งใดมากระตุ้น
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