Usually, acupuncture at human acupoints will produce a feeling of acid, numbness, swelling and heaviness. Sometimes it is a feeling that is hard to describe. Some patients will feel comfortable, which can be said to be a kind of comfortable pain, but some patients will mistake this uncomfortable feeling of numbness for pain. This uncomfortable pain exists in "acupoints" and "meridians", not in the epidermis, but usually in the deep.

From a professional point of view, these feelings show that they are "angry" and are a response to correct acupoints and effective techniques. If these feelings are weak, the acupuncturist will sometimes adjust the feeling of "getting angry" according to different conditions and different constitutions to enhance the therapeutic effect of acupuncture.

The specific principles of acupuncture are as follows:

1. Stimulate the sensation transmission along the meridian with different methods, such as acupuncture at Zusanli point, and under the effect of the sensation transmission along the meridian, the gastric peristalsis is obviously enhanced, thus treating stomach pain and abdominal distension;

2. Acupuncture at Ren Ying point can regulate the vasodilation and contraction function of blood vessels and reduce blood pressure;

3. To achieve analgesic effect by increasing the pain threshold and treat various pain diseases;

4, enhance human immunity, improve blood circulation, can preserve health, prevent diseases and strengthen the body.

Refer to the above? Baidu encyclopedia-acupuncture