Cupping creates suction on your skin to increase blood flow, loosen tight tissue, and trigger your body’s natural pain-relief responses. The cups, typically made of glass or silicone, form a vacuum that pulls skin and underlying tissue upward, producing a cascade of physiological changes beneath the surface. Whether you’ve seen the circular marks on an athlete’s back or you’re considering it for pain, here’s what’s actually happening in your body during and after a session.
How Cupping Changes Blood Flow and Tissue
When a cup is placed on your skin, the vacuum draws blood into the area, dilating the tiny capillaries just below the surface. This increases the volume of blood flowing through the treated region and raises the rate at which fluid filters through capillary walls into the surrounding tissue. The result is a flush of fresh, oxygen-rich blood to muscles and connective tissue that may have been tight or sluggish.
That suction also loosens adhesions in the connective tissue (fascia) that wraps around your muscles. Think of it as a reverse massage: instead of pressing down to release tension, cupping pulls tissue upward and apart. This mechanical stretch can relax overactive muscles, and researchers believe the process stimulates nitric oxide release in local tissue, which further relaxes blood vessels and improves circulation. The negative pressure also helps draw stagnant fluid, inflammatory compounds, and metabolic waste products out of deeper tissue layers and toward the surface, where your lymphatic system can clear them more efficiently.
Cupping has also been shown to stimulate the autonomic nervous system, the part of your nervous system that controls unconscious functions like heart rate and digestion. This may explain why many people feel deeply relaxed during and after a session, similar to the effect of a deep-tissue massage.
Dry Cupping vs. Wet Cupping
There are two main types. Dry cupping uses suction alone. Cups are placed on the skin, a vacuum is created (by heat or a pump), and they sit for several minutes. No skin is broken. This is the version most common in Western physical therapy and sports recovery settings.
Wet cupping adds a second step. After a brief round of suction, the practitioner makes small, shallow scratches on the skin’s surface, then reapplies the cups. The suction draws out a small amount of blood and interstitial fluid, far less than a blood draw. The minor skin incisions trigger your immune system to send inflammatory cells to the area, which jumpstarts a localized healing response. Those tiny wounds also prompt your body to release its own natural opioids, chemicals that reduce pain and improve mood. Wet cupping is more common in traditional Middle Eastern and East Asian practices.
What the Evidence Says About Pain Relief
Cupping’s most studied benefit is pain reduction. A systematic review and meta-analysis of trials on chronic pain found that cupping produced large short-term improvements in pain intensity compared to no treatment at all. However, when researchers compared cupping to sham cupping (cups placed without real suction), the difference shrank and was no longer statistically significant. The same pattern held when cupping was compared to other active treatments like physical therapy or medication.
For disability and functional limitation, cupping showed moderate improvements over both no treatment and other active therapies. This suggests cupping may genuinely help people move better and feel less restricted, even if part of the pain relief comes from the ritual and expectation of treatment. That doesn’t make the benefit imaginary. Placebo responses involve real neurochemical changes in the brain, and if someone consistently feels better after cupping, that functional improvement is real for them.
The evidence is strongest for musculoskeletal pain, particularly in the low back and neck. Results for conditions like headaches and fibromyalgia are more mixed and less well studied.
Cupping for Athletic Recovery
Athletes use cupping primarily to speed recovery between training sessions. The theory is straightforward: by increasing blood flow to fatigued muscles, cupping helps clear metabolic byproducts like lactate and delivers nutrients needed for tissue repair. Research confirms that cupping can reduce pain and disability while increasing range of motion in athletes.
The picture is less clear for specific recovery markers. Studies measuring blood lactate and creatine kinase (an enzyme that spikes when muscles are damaged) have found that both rise after intense exercise regardless of whether cupping is applied, and cupping doesn’t appear to significantly accelerate the clearance of either marker within 30 minutes. The recovery benefit may be more about reducing perceived soreness and restoring mobility than about measurably changing muscle biochemistry.
Anti-Inflammatory Effects
Lab research has identified a more specific mechanism behind cupping’s effects on inflammation. Cupping appears to reduce the expression of key inflammatory signaling molecules, specifically the proteins that amplify and sustain an inflammatory response in tissue. In cell studies, cupping effectively blocked the chain reaction that leads to prolonged inflammation, while simultaneously promoting the growth of new blood vessels to improve healing in the treated area.
This dual action, calming inflammation while boosting blood supply, could explain why cupping seems to help with conditions where chronic low-grade inflammation plays a role, from persistent muscle tightness to certain types of joint pain.
What the Marks Mean and How Long They Last
The circular marks left by cupping are not bruises in the traditional sense. Bruises come from impact that damages tissue. Cupping marks result from blood being drawn to the surface through intact capillaries, a process called petechiae. The color of the marks can tell you something about what’s happening in the tissue beneath.
- Pale pink or no mark: good circulation in that area, minimal stagnation.
- Light to medium pink: some fluid accumulation but healthy blood flow overall.
- Dark red: significant stagnation or inflammation in the underlying tissue.
- Deep purple: the most congested areas, often corresponding to chronic tension or poor circulation.
Light pink marks typically fade within a few hours. Red marks can take several days to a week. Deep red or purple marks may linger for two weeks or more, though virtually all cupping marks resolve completely within two weeks. The marks tend to be lighter with subsequent sessions as circulation in the area improves.
Safety and Who Should Avoid It
Cupping is generally low-risk when performed by a trained practitioner, but it’s not appropriate for everyone. People taking blood-thinning medications face a higher risk of excessive bruising or bleeding, particularly with wet cupping. Those with skin conditions like eczema should avoid cupping over affected areas, since the suction can worsen irritation, and broken or oozing skin carries a risk of bacterial infection.
There is a small risk of skin burns when traditional fire cupping is used (where a flame heats the air inside a glass cup before placement). Silicone cups and pump-operated cups eliminate this risk entirely. Cupping should also be avoided over areas with deep vein thrombosis, open wounds, or active skin infections. Pregnant women are typically advised to avoid cupping on the lower back and abdomen.
The most common side effect is simply the marks themselves, along with mild soreness in the treated area that feels similar to post-workout muscle tenderness. This usually resolves within a day or two.