Cupping Therapy Explained: What It Is, How It Works, and What the Evidence Shows

Cupping became globally visible when Michael Phelps appeared at the 2016 Olympics with circular bruise-like marks across his shoulders and back. The response ranged from curiosity to concern — the marks look dramatic and unfamiliar to eyes accustomed to Western therapeutic practices. But cupping is one of the oldest documented medical techniques in the world, appearing in Chinese, Egyptian, Greek, and Middle Eastern traditions with essentially the same mechanism: creating suction on the body's surface to draw blood, qi, and fluids toward the skin.

This article covers what cupping actually does in both TCM and physiological terms, the main types, what conditions it is used for, and what the research currently shows.

What Is Cupping?

Cupping (ba guan, literally "pulling cups") involves placing cups on the skin and creating negative pressure — suction — that draws the skin and superficial muscle tissue upward into the cup. The traditional method creates suction by briefly placing a flame inside the cup to heat the air before placing it on the skin; when the cup cools, the contracting air creates suction. Modern practices also use pump-action cups that create suction mechanically without heat.

The cups are typically left in place for 5–15 minutes. During this time, the suction draws blood and fluids toward the surface. The characteristic circular marks — often dark red, purple, or sometimes almost black in colour — are caused by petechiae: small ruptures in the superficial capillaries as blood is drawn to the surface under negative pressure. They are not bruises in the conventional sense (bruises result from impact trauma); they are extravasated blood from capillary rupture under suction.

The colour of the marks is diagnostically significant in TCM: darker marks indicate more significant blood stasis or pathogen accumulation; lighter or pink marks indicate less stasis; no marking suggests the area has good circulation.

TCM Framework for Cupping

In Chinese medicine, cupping works by:

Moving qi and blood: Suction stimulates qi and blood movement in the channels beneath the cups. When qi and blood are stagnant — from cold invasion, injury, or chronic tension — cupping breaks up the stagnation and restores free flow.

Expelling wind-cold: Cupping on the back, particularly along the bladder channel, is used to draw wind-cold out of the exterior — the early stage of cold and flu. The cups are understood to pull the pathogen toward the surface and out. This is one of the oldest applications and is supported by traditional texts dating back over two thousand years.

Warming channels: When fire cupping is used, the heat involved warms the channels directly, which is specifically indicated for cold-type presentations — chronic back pain worsened by cold, cold-type arthritic pain.

Draining dampness: Cupping can help drain accumulated fluid and dampness from specific areas, particularly in the upper back and shoulders where tension and fluid accumulation frequently co-occur.

Types of Cupping

Fire cupping: The traditional method. A flame is briefly placed inside the cup to heat the air; the cup is quickly placed on the skin, and as the air cools and contracts, suction is created. Produces strong, consistent suction. The cups used are typically glass or bamboo.

Pump cupping: Plastic cups with a hand pump that creates suction mechanically. No flame required. Easier to control suction level precisely. Less dramatic but equally effective for most applications.

Sliding cupping (walking cups): A thin layer of oil is applied to the skin, and the cup is moved across a broad area rather than left in one position. Less likely to leave marks; functions more like a deep tissue massage. Used along the bladder channel of the back for general muscular tension and qi movement.

Flash cupping: Cups are applied briefly and removed quickly, repeatedly, over an area. Used to stimulate qi movement without creating the suction marks of stationary cupping. Often used on the upper back for early cold and flu, or for children and sensitive patients.

Wet cupping (ba guan xue luo / hijama): Involves making small superficial incisions in the skin before applying the cup, allowing a small amount of blood to be drawn out. Used in both Chinese and Middle Eastern traditions for more significant blood stasis conditions. Less commonly practiced in contemporary Chinese clinical settings than dry cupping.

Common Applications

Musculoskeletal pain — particularly upper back, neck, and shoulders: The most common contemporary use. Cupping along the bladder channel (which runs parallel to the spine) addresses both local muscle tension and the underlying channel stagnation. For chronic tension patterns — the kind that accumulates from desk work, poor posture, and chronic stress — cupping provides relief that manual massage sometimes cannot reach because it works from the inside of the tissue outward rather than from the surface inward.

Wind-cold invasion (early cold and flu): Applied on the upper back (particularly between the shoulder blades) at the very first signs of a cold — chills, slight sore throat, body aches. The goal is to draw the pathogen out before it penetrates deeper. Timing matters — this application is most effective in the first 12–24 hours.

Respiratory conditions: Cupping on the upper back and over the lung zones is used in TCM for chronic cough, asthma, and bronchitis. Respiratory conditions in TCM often involve phlegm and qi obstruction in the lung channels; cupping moves this obstruction.

Chronic back pain: Particularly cold-type or damp-type back pain — pain that is worse in cold and wet weather, feels heavy and dull, and is not improved by rest. Fire cupping warms the channels and moves the cold-dampness.

Digestive conditions: Cupping on specific abdominal points is used for digestive presentations, though this is less common in contemporary practice than back cupping.

What the Research Shows

The evidence base for cupping is mixed but more substantial than critics typically acknowledge:

Systematic reviews of non-specific neck and back pain: Multiple systematic reviews — including a notable 2011 review in PLOS ONE and subsequent analyses — find evidence for cupping providing short-term pain relief superior to no treatment and comparable to conventional physical therapies for musculoskeletal pain. Effect sizes are modest but consistent.

Herpes zoster (shingles): A 2015 Cochrane review of cupping for herpes zoster found positive evidence relative to antiviral drugs alone, with cupping providing additional pain relief. This is one of the stronger evidence areas.

Cancer-related fatigue: Several Chinese RCTs have shown benefit for cupping in managing cancer-related fatigue as a complementary intervention.

Mechanism research: Some physiological mechanisms have been proposed and partially investigated:

• Local vasodilation and increased blood flow in the treated area
• Stimulation of the immune system through the inflammatory response triggered by petechiae
• Fascial release effects from the decompressive suction
• Local changes in pain thresholds via counter-irritation mechanisms

The evidence is generally limited by small sample sizes and methodological variability — common problems in TCM research. The conclusion that seems reasonable: cupping is likely beneficial for musculoskeletal conditions and has plausible physiological mechanisms; stronger evidence requires larger, better-controlled trials.

Safety and Considerations

Cupping is generally safe when performed by a trained practitioner. Key considerations:

The marks are temporary: The characteristic circular marks typically fade within three to seven days. They are not painful after the session (unlike actual bruises) and are not a cause for concern.

Contraindications: Cupping should not be applied over broken skin, varicose veins, bony prominences, or inflamed or infected skin. Wet cupping requires additional precautions and appropriate sterilisation. Cupping is generally avoided during pregnancy, particularly on the abdomen and lower back.

Skin sensitivity: People with very thin or sensitive skin, or those on blood thinners, may mark more significantly and should inform their practitioner.

Not appropriate for all conditions: Cupping is a yang-promoting, stagnation-resolving therapy. It is most appropriate for excess and stagnation patterns — cold, damp, blood stasis, qi obstruction. For significant deficiency conditions — severe qi deficiency, blood deficiency, yin deficiency — cupping may be too draining and other approaches are preferred.

Cupping in the Broader TCM Context

Cupping is one of the external treatment methods in Chinese medicine — alongside acupuncture, gua sha, and moxibustion — that works directly on the channels and surface of the body. These methods are often combined: moxibustion warms; cupping moves; gua sha scrapes stagnation from the surface; acupuncture regulates the channels through needling.

For someone new to TCM's physical therapies, cupping is often a good starting point — the effects are immediate, palpable, and easy to understand, and the application does not require the same level of anatomical precision as acupuncture. The dramatic visual result is also, paradoxically, useful: it makes visible the stagnation that TCM practitioners are working to resolve, and watching the marks change colour and fade over subsequent days gives a tangible sense of the body's clearing process.