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    Chronic Pain - Cause

    The cause of chronic pain is not clear.

    When you have an injury or illness, certain nerves send pain signals to your brain. With chronic pain, these pain signals keep going for weeks, months, or even years after you recover.

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    Chronic pain can develop after a major injury or illness, such as a back injury or shingles, or it can happen without a known cause. It is also possible that certain brain chemicals that usually suppress pain stop working the way they're supposed to.

    Pain can affect:

    You can have more than one kind of pain at the same time. For example, fibromyalgia can cause pain in muscles and nerves.

    WebMD Medical Reference from Healthwise

    Last Updated: March 12, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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