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Causes

Long-term illness or disease, ongoing conditions, and injuries are the most common causes for chronic pain. Other causes include damage to the central or peripheral nervous system and vascular conditions. Long-term illnesses that may result in chronic pain include the following:

Cancer
Degenerative disease (e.g., osteoarthritis, osteoporosis)
Fibromyalgia
Inflammatory disease (e.g., rheumatoid arthritis)
Multiple sclerosis

Cancer patients often experience chronic pa...Read the full article