Chinese cupping uses suction cups placed on the skin to increase blood flow, relieve muscle tension, and reduce pain. The practice has been part of traditional Chinese medicine for thousands of years and is now widely used by acupuncturists, physical therapists, and sports medicine practitioners. The cups create negative pressure that pulls skin and underlying tissue upward, triggering a cascade of local physiological responses.
How Cupping Works in the Body
When a cup is placed on your skin, the suction dilates the small blood vessels underneath. Your body releases natural vasodilators, including histamine and adenosine, which widen those vessels further and increase blood circulation to the area. This boost in local blood flow brings more oxygen to the tissue and helps clear metabolic waste products like lactate.
The suction also creates a kind of controlled micro-injury. Your immune system responds by sending neutrophils (first-responder white blood cells) to the area while reducing the concentration of lymphocytes locally. This artificial inflammatory response appears to activate the complement system, a part of your immune defense, and shift certain immune markers. Levels of an antibody associated with allergic responses (IgE) decrease, while a protein involved in immune activation (C3) increases.
In simpler terms, cupping tricks your body into mounting a localized healing response in an area that may be tight, sore, or sluggish. The tissue under the cup also shifts toward anaerobic metabolism. One study using sensors implanted just beneath the skin found that the ratio of lactate to pyruvate (two byproducts of energy use) remained elevated for over two and a half hours after just 15 minutes of cupping, suggesting a prolonged metabolic shift in the treated tissue.
The Traditional Chinese Medicine View
In traditional Chinese medicine, cupping is understood as a treatment for qi and blood stagnation. Qi (roughly translated as vital energy) is believed to flow through channels in the body, and when that flow becomes blocked, pain and illness follow. Cupping is thought to pull stagnation out of deeper tissue layers, functioning somewhat like a deep tissue massage in reverse: instead of pushing into the muscle, it lifts and separates the tissue.
Practitioners adjust the strength of suction depending on whether they’re treating an excess condition (too much buildup) or a deficiency (not enough flow). The color of the marks left behind is traditionally used as a diagnostic clue. Darker marks are interpreted as areas with more stagnation, while lighter pink marks suggest the tissue was already circulating well.
Dry Cupping vs. Wet Cupping
There are two main types. Dry cupping uses suction alone. Cups are placed on the skin using heat (fire cupping) or a manual pump, creating a vacuum that lifts the tissue. Sessions typically last 5 to 10 minutes per placement, though no universal standard exists for exact pressure or duration.
Wet cupping, known as hijama in Arabic medical tradition, combines dry cupping with controlled bloodletting. After the cups are removed, small superficial incisions are made in the skin, and the cups are reapplied to draw out a small amount of blood. Research has found that this blood contains higher concentrations of oxidative stress markers (MDA and nitric oxide) compared to regular venous blood, suggesting that wet cupping may preferentially remove blood carrying higher levels of metabolic waste. Wet cupping has also been associated with higher oxygen saturation in the treated area and elimination of lactate from subcutaneous tissues.
What the Evidence Says About Pain Relief
Pain management is the most studied use of cupping. A systematic review and meta-analysis of studies on chronic pain found that cupping produced a large short-term reduction in pain intensity compared to no treatment at all. The effect size was substantial, roughly equivalent to a one-point drop on a standard pain scale.
The picture gets more complicated when cupping is compared to a placebo. When researchers used sham cupping (cups placed without real suction) as a control, the difference in pain relief was small and not statistically significant. The same was true when cupping was compared to other active treatments like physical therapy or medication. This pattern suggests that some of cupping’s pain-relieving effect comes from the ritual, expectation, and sensory experience of the treatment itself, not solely from the suction.
For physical disability, results were somewhat more promising. Cupping showed a medium-sized improvement compared to no treatment and even compared to other active treatments. This hints that cupping may help people move and function better, even if some of the pain relief involves a placebo component.
Cupping for Athletic Recovery
Cupping gained mainstream visibility when Olympic swimmers showed up with circular marks on their shoulders in 2016, and it remains popular among athletes. The theory is that increased blood flow speeds the removal of metabolic byproducts that accumulate during intense exercise.
A study on handball players found that dry cupping reduced levels of creatine phosphokinase (CK), an enzyme that spills out of damaged muscle cells after hard exercise, following an all-out cycling test. Lower CK suggests less muscle damage or faster clearance of damage markers. However, the same study found no effect on lactate dehydrogenase, another marker of tissue stress, and blood pressure responses were unchanged. Research on gymnasts similarly found that 30 minutes of cupping helped CK levels return to baseline faster after training.
The evidence is encouraging but limited. Most athletic recovery studies are small, and researchers have noted that taking blood samples at only one or two time points makes it hard to track the full arc of recovery. Cupping likely helps with perceived recovery and muscle relaxation, but it’s not a replacement for sleep, nutrition, and proper training load management.
What the Marks Mean and How Long They Last
The circular discolorations left after cupping are not true bruises. Bruises form when blunt trauma crushes tissue and ruptures blood vessels. Cupping marks, technically called petechiae, form when suction draws blood to the skin’s surface and tiny capillaries break under the negative pressure. They’re typically painless to the touch.
Light pink or red marks usually fade within a few hours to one day. Deeper purple or dark red marks, which indicate more blood was pulled to the surface, can take up to two weeks to fully resolve. The color and duration depend on how much suction was applied, how long the cups stayed on, and how much underlying congestion existed in the tissue. If you have a visible event like a wedding or beach vacation, plan your timing accordingly.
Risks and Who Should Avoid It
Cupping is generally low-risk when performed by a trained practitioner, but it’s not without side effects. Persistent skin discoloration is the most common. Burns can occur with fire cupping if the technique is sloppy. Infections are possible, particularly with wet cupping, if sterile protocols aren’t followed. Scarring is rare but documented.
People with eczema or psoriasis should be cautious, as cupping can worsen these conditions. The suction and skin irritation can trigger flares in areas that are already inflamed or compromised. Cupping over sunburned skin, open wounds, or areas with active skin infections is also a bad idea. If you’re on blood thinners, the capillary rupture that creates those characteristic marks could be more extensive than expected.
What a Typical Session Looks Like
You’ll usually lie face down while cups are placed along your back, shoulders, or neck, though they can be applied to legs, arms, and other areas depending on your complaint. The practitioner either heats the air inside a glass cup with a flame (which creates suction as the air cools) or uses silicone or plastic cups with a hand pump. You’ll feel a pulling, tight sensation as the skin lifts into the cup. Most people describe it as unusual but not painful.
Cups stay in place for 5 to 10 minutes in most protocols. Some practitioners use sliding cupping, where oil is applied to the skin and a single cup is moved across a larger area, combining suction with massage-like strokes. After the cups are removed, the skin may feel warm and slightly tender. Most people can return to normal activity immediately, though you may want to keep the treated area covered for cosmetic reasons while the marks fade.