It is based on the concept of life energy (qi), which purportedly flows through "meridians" in the body.
[2] Although some medical studies have suggested that acupressure may be effective at helping manage nausea and vomiting, insomnia, low back pain, migraines, and constipation, among other things, such studies have been found to have a high likelihood of bias.
The traditional Chinese medicine (TCM) theory for the selection of such points and their effectiveness is that they work by stimulating the meridian system to bring about relief by rebalancing yin, yang and qi (also spelled "chi").
Well-designed, randomized controlled studies are needed to determine the utility and efficacy of acupressure to manage a variety of symptoms in a number of patient populations.
EBM reviewer Bandolier said that P6 in two studies showed 52% of patients with control having a success, compared with 75% with P6.
[11] Quackwatch includes acupressure in a list of methods which have no "rational place" as massage therapy and states that practitioners "may also use irrational diagnostic methods to reach diagnoses that do not correspond to scientific concepts of health and disease.
"[12] Clinical use of acupressure frequently relies on the conceptual framework of traditional Chinese medicine.
There is no physically verifiable anatomical or histological basis for the existence of acupuncture points or meridians.
Acupuncturists tend to perceive TCM concepts in functional rather than structural terms (e.g., as being useful in guiding evaluation and care of patients).
[14] Trials using placebo have not demonstrated any statistically significant effect but concluded that acupressure is safe to use along with conventional treatment.