Meridian points are specific locations on the body, mapped by traditional Chinese medicine (TCM), where energy and blood flow can be stimulated to produce therapeutic effects. There are over 360 recognized points, and they sit along a network of pathways called meridians that run through the body. These points are the foundation of acupuncture, acupressure, and several other healing practices that have been used for thousands of years.
The Meridian System Explained
In TCM, the body contains an interconnected web of channels called the Jing Luo system. “Jing” refers to the major channels that run vertically through the body, while “Luo” refers to smaller connecting channels that branch off horizontally, reaching every tissue. Together, they form a network that circulates vital energy (called Qi) and blood to nourish organs, muscles, and joints while keeping the body in balance.
Think of it like a transit system. The major channels are the main train lines running up and down the body. The collateral channels are the smaller bus routes that branch off and connect neighborhoods to each other. Meridian points are the stations along these routes, places where you can access the system and influence the flow of energy through it.
The 12 Primary Meridians
The core of the system consists of 12 primary meridians, each linked to a major organ. Six run through the arms and six through the legs, and each is classified as either Yin or Yang based on its location on the body. The inner (medial) surfaces of the arms and legs carry Yin meridians, while the outer (lateral) surfaces carry Yang meridians.
The five solid organs, considered Yin, are the lungs, heart, liver, kidneys, and spleen. The six hollow organs, considered Yang, are the stomach, small intestine, large intestine, gallbladder, bladder, and a functional concept called the triple energizer (San Jiao), which doesn’t correspond to a single Western anatomical organ but relates to the body’s regulation of fluids and heat across three zones of the torso.
The naming system is more nuanced than it might seem. Each meridian’s original Chinese name encodes which limb it travels through, which body region it covers, and which organ it connects to internally. The Hand YangMing meridian, for example, is commonly called the Large Intestine meridian in English, but its original name was the “Tooth meridian” because its external pathway connects to the teeth and nose. Similarly, the Hand TaiYang meridian is called the Small Intestine meridian, but was originally named the “Shoulder meridian” because it runs through the shoulder region. The English organ-based names are a simplification that can be misleading.
Beyond the 12 primary meridians, there are two additional central channels: the Governing Vessel running up the spine and the Conception Vessel running up the front of the body. Together with the 12 primary meridians, these form the 14 regular meridians that contain the majority of acupuncture points. An additional set of 15 collateral channels connects the primary meridians to each other, creating the full network.
What Meridian Points Actually Are
Meridian points (also called acupoints) are discrete spots along these channels where stimulation is thought to regulate the flow of Qi and blood. Over 360 standard points have been mapped, plus dozens of “extra” points that fall outside the main meridians. Each point has a specific location, typically described relative to anatomical landmarks like bone edges, muscle borders, or skin creases, and each is associated with particular therapeutic effects.
These points aren’t random. Research measuring the biophysical properties of skin has found that acupoint locations behave differently from surrounding tissue. Acupuncture points and meridian lines consistently show lower electrical skin resistance and higher capacitance than nearby non-acupoint areas. In one study measuring skin impedance, a point on the wrist (Lung 9) showed lower impedance than a nearby control spot in all four volunteers tested. A point on the inner forearm (Pericardium 6) showed the same pattern in three of four volunteers. A separate imaging study found that high-luminosity lines on the body surface overlapped with the 14 classical meridians at a rate of about 93%.
These measurable differences suggest that something physically distinct is happening at these locations, even if the full explanation remains incomplete.
How Qi and Blood Flow Through Meridians
Traditional theory describes two substances circulating through the channels. Blood flows through vessels, which overlaps partly with what Western medicine recognizes as the cardiovascular system, though the large blood vessels don’t perfectly align with meridian lines. Qi, particularly a type called Wei-Qi (defensive energy), flows through the spaces between muscles, bones, and other tissues, in the interstices that run longitudinally through the body.
When this flow moves smoothly, the body stays healthy. When it stagnates or becomes deficient in certain areas, symptoms appear. The therapeutic principle behind stimulating meridian points is straightforward: open blocked channels and restore balanced circulation. In TCM terms, this is described as “dredging the channels and regulating Qi and blood” to rebalance Yin and Yang.
How Meridian Points Are Stimulated
The three most common methods target the same points but use different forms of stimulation. Acupuncture inserts thin needles into specific points, typically to a depth of a few millimeters to a couple of centimeters depending on location. Acupressure applies firm finger or thumb pressure to the same points without breaking the skin, making it something people can practice on themselves. Moxibustion uses heat from burning dried mugwort herb held near or on a point to warm and stimulate it.
Other methods include cupping (placing suction cups over points or along meridian lines), electroacupuncture (adding a mild electrical current to inserted needles), and gua sha (scraping the skin along meridian pathways to increase circulation). All of these share the same underlying logic: accessing the meridian system through its surface points to influence what’s happening deeper inside the body.
What Science Has Found So Far
The meridian system doesn’t map neatly onto any single structure that Western anatomy recognizes, which has made it a subject of ongoing scientific investigation. The most promising line of research points to the body’s fascia, the connective tissue that wraps around muscles, organs, and bones in continuous sheets throughout the body.
A multicentre study examining human cadavers found that the fascia network resembles the theoretical meridian system in significant ways. The researchers identified fascia fibers running along the same courses as classical acupuncture meridians, and concluded that the body’s superficial fascia, along with deeper connective tissue layers, likely forms the physical substrate of the meridian system. Physiological, histological, and clinical observations supported this conclusion.
A separate and more controversial line of research has explored something called the Primo Vascular System (PVS), a network of tiny threadlike structures first described by Korean researcher Bong-Han Kim in the 1960s. Kim claimed to have found a previously unknown vascular system that corresponded to acupuncture meridians, demonstrated by injecting dye into an acupoint and watching it travel along the meridian pathway. Decades later, researchers at Seoul National University confirmed the existence of PVS structures inside blood vessels, lymphatic vessels, and on the surfaces of internal organs. However, the most critical piece, finding PVS structures in the skin where acupuncture points are located, remains unconfirmed. The techniques that work for detecting PVS inside the body haven’t been successfully applied to the skin.
What is well established is that acupoint locations are biophysically distinct from surrounding tissue. They show lower electrical resistance, different thermal properties, and higher luminosity under certain imaging conditions. Whether these differences are explained by fascia, a novel vascular system, or some combination of structures, the measurable reality of these points is not seriously disputed, even as the full mechanism behind them continues to be studied.