Fire cupping is a form of therapy where a practitioner uses an open flame to heat the inside of a glass cup, then places it on your skin. The heat drives oxygen out of the cup, creating a vacuum that pulls your skin and underlying tissue upward into the cup. It’s one of the oldest healing techniques in recorded history, documented in both ancient Egyptian and Chinese medical practices, and it remains widely used today for pain relief, muscle recovery, and general wellness.
How Fire Cupping Creates Suction
The basic mechanism is simple physics. A practitioner typically soaks a cotton ball in alcohol, lights it, and briefly swirls it inside a glass cup. This burns off the oxygen inside the cup. The practitioner then quickly removes the flame and places the cup open-side down on your skin. As the air inside cools, it contracts, creating a partial vacuum that draws your skin and soft tissue upward.
This suction triggers several responses in the body. Blood volume increases in the treated area, capillary filtration rates rise, and fluid from between your cells gets pulled toward the surface. The negative pressure may also stimulate production of nitric oxide, a molecule your body uses to widen blood vessels and regulate blood flow. The increased pressure difference is also thought to activate your lymphatic system, helping clear accumulated fluids and metabolic waste from the tissue underneath.
What Happens During a Session
Most fire cupping sessions use between four and eight cups placed on the back, shoulders, neck, or other large muscle groups. The cups stay in place for 5 to 10 minutes. Practitioners generally keep sessions under 10 minutes per area to avoid blistering the skin.
There are a few variations in technique. In stationary cupping, the cups are placed and left in one spot. In sliding cupping, oil is applied to the skin first, and the practitioner moves a single cup across a larger area while maintaining suction. Flash cupping involves quickly applying and removing cups in succession, creating a rapid on-off suction effect. All three use the same fire-based vacuum method but produce slightly different sensations and effects.
Most people describe the feeling as a firm, pulling pressure rather than pain. Some areas may feel more intense than others, especially over tight or knotted muscles.
Those Circular Marks Aren’t Bruises
The most visible effect of cupping is the round, reddish-purple marks left on the skin afterward. These look dramatic, but they’re not the same as bruises. Traditional bruises result from impact that damages muscle fibers. Cupping marks form because the suction breaks open tiny blood vessels called capillaries near the skin’s surface, allowing small amounts of blood to pool in the tissue. The marks typically fade within one to two weeks and don’t involve the muscle damage associated with actual bruising.
If you have cupping marks when visiting a doctor or going to a hospital, it’s worth mentioning their origin so they aren’t mistaken for signs of injury.
What the Evidence Says About Pain Relief
Cupping has been applied across internal medicine, gynecology, dermatology, and pediatrics, but the strongest body of research focuses on pain. A large evidence-mapping study that evaluated 14 meta-analyses found that cupping therapy showed effectiveness for chronic pain, knee osteoarthritis, low back pain, neck pain, and nerve pain from shingles. One clinical study found cupping was more effective than sham therapy at improving pain and functional disability in people with persistent nonspecific low back pain. Another found that a single session of dry cupping produced immediate short-term pain reduction.
That said, the overall quality of evidence remains limited. When researchers graded the available studies, none qualified as high-quality evidence. Most fell into the low or very low range, with a smaller portion rated moderate. For knee osteoarthritis specifically, three moderate-quality analyses suggested cupping may reduce pain scores. The research is encouraging but not yet definitive, which is typical for therapies that are difficult to test with traditional blinded trials (it’s hard to give someone a convincing fake cupping treatment).
Fire Cupping vs. Pump Cupping
Modern cupping sets often use silicone or plastic cups with a hand pump that creates suction mechanically, no flame required. The therapeutic suction is essentially the same in both methods. The key difference is control and sensation. Pump cups allow precise adjustment of suction strength. Fire cupping produces a more consistent, even pull and adds a brief warming sensation from the heated glass, which some people find more relaxing for tight muscles. Practitioners trained in traditional Chinese medicine typically favor fire cupping, while physical therapists and sports medicine providers may lean toward pump-based systems for convenience.
Safety and Who Should Avoid It
Cupping is generally considered safe when performed by a trained practitioner, but it does carry some risks. Burns from heated cups are the most specific concern with fire cupping, since an open flame is involved. Other potential side effects include persistent skin discoloration, scarring, and, rarely, infection. Cupping can also worsen certain skin conditions, particularly eczema and psoriasis.
Several groups should avoid cupping entirely:
- People with bleeding disorders such as hemophilia, or those with a history of blood clots, deep vein thrombosis, or stroke
- People with cardiovascular disease or those who have a pacemaker
- People with anemia, since cupping draws blood toward the surface
- People with active skin conditions like eczema or psoriasis in the treatment area
- People with epilepsy
- Pregnant women, since the effects of cupping on pregnancy haven’t been studied enough to confirm safety
Equipment hygiene also matters. Because cupping gear can come into contact with blood, either intentionally in wet cupping or accidentally when capillaries break, reusing equipment between patients without proper sterilization can transmit bloodborne infections like hepatitis B and C.
Finding a Qualified Practitioner
Cupping doesn’t have a single universal license in the United States. Instead, it typically falls under the scope of practice for licensed acupuncturists, massage therapists, physical therapists, and athletic trainers. The International Cupping Therapy Association requires that practitioners have hands-on bodywork training, including soft tissue manipulation, joint work, and kinesiology, before they’re eligible for cupping certification courses. Their programs are recognized for continuing education credits by the National Certification Board for Therapeutic Massage and Bodywork, as well as by licensing boards in states like Florida, Texas, Louisiana, and others.
When choosing a practitioner, look for someone with a primary healthcare or bodywork credential (licensed massage therapist, physical therapist, licensed acupuncturist) plus specific cupping training. Ask whether they sterilize or use single-use equipment, and whether they’ve been trained specifically in fire cupping if that’s the method you want. In unskilled hands, cupping can cause unnecessary pain and tissue damage, so training matters more than it might seem for what looks like a straightforward technique.