Belly button on 4 inches is equivalent to the width of 5 fingers on the navel. In Chinese medicine, there is the expression “horizontal finger with the body inch”, also known as “finger inch positioning method”, which is generally used by the patient’s own four fingers together, except for the thumb, to take the level of the middle finger for 3 inches, the joint of the thumb horizontal degree for 1 inch, the two add up to 4 inches. However, it should be noted that the 4 inches here is only an approximate length for easy positioning of the point, and is not equal to the true 4 inches. In Chinese medicine, there is an acupuncture point at the intersection of 4 inches above the navel and the midline of the body, called the Zhongyi point. It is a meeting point where different meridians meet together and is located in the body projection area of the stomach, rich in intercostal nerves. Acupuncture can promote gastrointestinal peristalsis and digestive juice secretion, thus helping to enhance gastrointestinal digestion and absorption, and can also assist in accelerating gastrointestinal blood circulation, promoting the dissipation of gastric mucosal inflammation and edema, and facilitating damage repair. Acupuncture of the middle epigastric point combined with moxibustion, massage and tui na can assist in the treatment of abdominal diseases. Deep acupuncture of the middle epigastric point can adjust the qi and blood of the internal organs, dredge the meridians, tonify the spleen and benefit the qi, help to remove the evil, as well as treat diseases of deficiency, stasis and meridian obstruction. In addition, the point also has the effect of “external circulation of all limbs and bones”, which is the channel for the passage of qi and blood and the contact with the internal organs. It is also effective in treating neurological diseases, obstetrical and gynecological diseases, cardiovascular diseases, mental diseases, and cervical spondylosis, frozen shoulder, and other diseases of the limbs and bones.