It works very simply, there is a two-step procedure: 1. Suppose you have 5000 rubles in your wallet 2. You have attended an acupuncture session and now you have 0 rubles. There are no more changes.
There is no evidence base regarding the effectiveness in the classical understanding of these methods.
However, they (more precisely, it can be called an anthology) are actively used (various acupuncture mats, Kuznetsov's applicator from that path, sujok, etc.) in rehabilitation .
Mechanical irritation, to put it simply, leads to a response in the form of a local change in the vascular tone of the microcerculatory bed towards its decrease, i.e. the flow of a larger volume of blood to this area is ensured, microcirculation improves, which in turn leads to better tissue nutrition, faster resolution of the non-infectious inflammatory process in this area, restoration of damaged structures, etc.
In addition, it affects on sensitivity (for the most part, sujok is used for this purpose) in favor of its restoration.
Regarding acupressure, it can be used to influence the reflexogenic zones to obtain one or another effect, depending on the pathology.
But again, this is all analogy.
In the classical sense of these concepts and techniques, it is difficult to talk about efficiency.
Acupuncture and all its varieties have been "under investigation" by science for quite a long time, there were really a lot of studies and meta-analyzes, the conclusions, unfortunately, are not comforting. There is no point in discussing the traditional principles of acupuncture, the presence of qi, yin-yang, and special points of chakra activation, let's leave these tales to Buddhist monks. Further, it was suggested that the mechanism of action lies in the stimulation of nerve endings and ganglia, or in the site of irritating action, etc. etc. But it all comes down to one thing. As I said, there have been many clinical trials over the past 30 years, and systematic reviews that rely primarily on high-quality research studies (randomized, large-sample, and without obvious bias) lead us to the following conclusions - with most diseases that acupuncture claims to treat, it benefits only as a placebo. It is worth saying that there are a couple of high-quality studies that confirm the therapeutic effect of acupuncture for some types of pain and nausea, in comparison with placebo, but other, equally high-quality studies lead to opposite conclusions, therefore, absolutely for all pathologies, data in favor of acupuncture or negative , or contradictory. And also do not forget that even in the case of back pain and nausea, acupuncture was compared with placebo, therefore in no case can it be said that acupuncture helps better than the generally recognized treatment for these problems, and often it is also 10 times more expensive, which is better, to go through 5 acupuncture sessions for 2 thousand rubles each, or to buy an anti-nausea remedy for a penny? Better yet, figure out the causes of the same nausea using normal medicine, rather than sticking needles into yourself.
Interested in the mechanism of action.