According to TCM, Acupressure points chart are aligned along 14 body meridians, or pathways. Twelve of the meridians are bilateral, that is, identical versions of them (with the same sets of points) exist on both sides of the body. The other two are unilateral, running along the midline of the body. The 14 meridians do not correspond to any known physiological processes or anatomical structures in the body, such as nerves or blood vessels. Nevertheless, some well–controlled studies suggest that Acupressure can be effective for a number of health problems, including nausea, pain and stroke–related weakness. A single point may be pressed for relief from a particular symptom or condition, or to promote overall well–being of the body. A series of points can be worked on in a specific order.