Unfortunately pain is something everybody in the world has experienced. There are two general categories for pain that are widely accepted. The first category is known as acute pain. Acute pain is short lived and serves as a warning signal. When you fix whatever is wrong, the pain usually goes away. The second category is known as chronic pain. When pain lasts for a long time, it is called chronic pain. This type of pain is often caused by illness or injury and it is complicated because the source of the pain is often unknown. According to poweroveryourpain.com some doctors consider pain to be chronic when it lasts one month longer than expected, but the general medical definition is pain that has lasted for six months or longer. Chronic pain is difficult to treat because it varies so much