A growing number of Americans would prefer to stop popping pills and avoid going under the knife to treat a bum knee, achy lower back or sore hip. Instead, they’re turning to the ancient Chinese practice of acupuncture to help ease chronic joint pain.

More than 14 million Americans have tried acupuncture, according to the most recent statistics from the National Health Interview Survey, a large ongoing study that tracks healthcare habits in the U.S. The study found that nearly six percent of Americans have allowed themselves to be pricked with dozens of slender needles to help alleviate chronic pain, up from just one percent of patients a decade ago.

“Use of acupuncture has been percolating for quite a while and it’s now becoming much more mainstream in medicine,” said Dr. Houman Danesh, director of integrative pain management at Mt. Sinai Hospital in New York.

So mainstream in fact, that it’s one of the few so-called “complimentary” or alternative medicine approaches covered by most health insurance plans. Even the military uses auricular acupuncture, a form of acupuncture that involves gently inserting small needles into various places on the ear that correspond with pain points elsewhere on the body.

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PHOTO: The military uses auricular acupuncture to treat pain on and off the battlefield.

Research studies consistently show that acupuncture can be an effective form of pain management, with some studies finding it even more effective than pain-relieving drugs or surgery. But exactly how it works remains somewhat of a mystery, Danesh admits.

In theory, acupuncture stimulates the body’s meridian points. By easing pressure on these energy-carrying channels, ancient Chinese physicians believed the needles corrected the body’s imbalances by allowing energy or “chi” to flow more freely. Although traditional Western medicine remains skeptical about the idea of chi, Danesh said that many of the meridian points happen to coincide with trigger points, spots on the body where pain radiates away from the center when pressed.

“Trigger points are widely accepted in modern medicine and one thought is that acupuncture may ease the stress on trigger points thereby lessening pain in that area,” he said.

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PHOTO: Ancient Chinese doctors believed acupuncture needles released a form of energy known as “chi.”

Meridian points also track closely with major nerve centers, Danesh said. It could be that the needles stimulate the nerves, causing them to release feel-good chemicals known as endorphins. People in pain often have low levels of endorphins, Danesh pointed out, and a release of those endorphins can suppress the sensation of pain.

There are still plenty of Acupuncture skeptics who believe that any pain relief acupuncture offers is strictly psychological. But Danesh said he doesn’t care why it works, so long as it works.

“I’ve had lots of skeptics come in for treatment and when they get better, they believe,” he said.

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PHOTO: More than 14 million Americans have tried acupuncture for pain relief.

Chronic pain is one of the most serious health problems in the U.S., affecting an estimated 100 million Americans, according to a 2011 Institute of Medicine report. Nearly 90 percent of respondents to an IOM survey said they coped with some level of pain on a daily basis.

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