5 Painful Facts You Need to Know | LiveScience: "First off, let's set the record straight: Pain is normal. About 75 million U.S. residents endure chronic or recurrent pain. Migraines plague 25 million of us. One in six suffer arthritis.
The global pain industry peddles more than $50 billion in drugs a year. Yet for chronic pain sufferers, over-the-counter pills are typically little help, while morphine and other narcotics can be addictive sedatives."