Cupping therapy is generally safe when performed by a trained practitioner, but it does carry real risks that range from mild bruising to, in rare cases, serious complications like infections or anemia. The type of cupping matters significantly: dry cupping, which uses suction alone, is considerably safer than wet cupping, which involves small skin incisions and blood draw. Understanding the difference, knowing who should avoid it, and choosing a qualified practitioner are the main factors that determine whether cupping is a low-risk experience or a potentially harmful one.
What Cupping Does to Your Body
Cupping works by placing cups on the skin and creating a vacuum, either through heat or a mechanical pump. That suction pulls skin and underlying tissue upward, dilating blood vessels in the area. Your body releases natural vasodilators like histamine and nitric oxide in response, which increases blood flow to the treated region. The result is localized swelling, redness, and the characteristic circular marks that can last days to weeks.
This increased circulation is the basis for most of cupping’s proposed benefits. The suction stimulates the autonomic nervous system and can promote muscle relaxation. In the cupped area, capillaries expand and dermal blood flow increases, which some practitioners believe helps clear metabolic waste from tissues and encourages healing. The tissue under the cup becomes visibly swollen and dense during treatment as red blood cells are drawn from blood vessels into surrounding tissue, a process called dry diapedesis.
Common Side Effects
The most universal side effect is the marks themselves. Every cupping session leaves circular discolorations on the skin that can look dramatic but are typically painless and fade within one to two weeks. These aren’t bruises in the traditional sense, though they involve the same pooling of blood under the skin.
Beyond the marks, the National Center for Complementary and Integrative Health (NCCIH) lists several possible side effects: persistent skin discoloration that outlasts the typical fading window, scarring, burns (particularly with fire cupping, where a flame heats the cup), and skin infections. Cupping can also worsen existing skin conditions like eczema or psoriasis. Mild soreness in the cupped area for a day or two after treatment is common and generally not a concern.
Dry Cupping vs. Wet Cupping
This distinction is the single most important safety factor. Dry cupping uses suction only. Wet cupping (also called hijama) adds a step: after the cups are removed, the practitioner makes small incisions in the skin and reapplies the cups to draw out small amounts of blood. That additional step introduces a fundamentally different risk profile.
Wet cupping is more frequently associated with infection, scarring, and vasovagal syncope (fainting). Because it involves blood, there is a real risk of transmitting blood-borne pathogens if equipment isn’t properly sterilized or disposed of. Proper wet cupping requires disposable cups, single-use surgical blades, vacuum pumps that aren’t shared between patients, and personal protective equipment for the practitioner. If any of those standards slip, the risk of infection climbs sharply.
Dry cupping is preferred in most Western clinical settings precisely because it avoids exposure to biohazardous fluids. It still carries risks of burns, blistering, and skin irritation, but the absence of open wounds makes serious complications far less likely.
Rare but Serious Complications
Most cupping sessions end with nothing worse than temporary marks, but documented case reports show what can go wrong. The NCCIH notes rare cases of bleeding inside the skull after cupping on the scalp and anemia from blood loss after repeated wet cupping sessions.
One published case from South Korea illustrates the extreme end of the risk spectrum. A patient received roughly 30 sessions of excessive cupping over two months from an unqualified practitioner. She developed iron-deficiency anemia severe enough to require a blood transfusion, with hemoglobin levels dropping to 6.2 g/dL, well below the normal range. She also had persistent circular skin pigmentation across her trunk and legs. The case highlights two compounding risk factors: an untrained practitioner and an excessive treatment frequency.
Other documented adverse events include skin abscesses, panniculitis (inflammation of the fat layer under the skin), blistering, and viral infections at puncture sites from wet cupping. Nearly all of these are attributed to errors in technique or sterilization rather than to cupping itself being inherently dangerous.
Who Should Not Get Cupping
Certain people face higher risks and should either avoid cupping entirely or proceed with extra caution:
- People on blood thinners. Anticoagulant medications increase the risk of excessive bleeding and severe bruising, making both wet and dry cupping riskier.
- People with skin damage. Sunburns, open wounds, skin ulcers, or recent trauma at the treatment site are all reasons to skip cupping in that area.
- People with eczema or psoriasis. Cupping can trigger flare-ups in affected skin.
- Pregnant women. Certain areas, particularly the lower abdomen, lower back, and specific acupuncture points, should not be cupped during pregnancy.
- Young children. Cupping is not recommended for children under four. For children aged four to seven, sessions should be limited to five minutes. For ages seven to fourteen, ten minutes is the recommended maximum.
How to Reduce Your Risk
The practitioner you choose is the biggest variable in your safety. In many U.S. states, cupping falls under the scope of licensed acupuncturists, chiropractors, or other regulated healthcare professionals. Virginia, for example, classifies cupping as part of acupuncture practice and requires practitioners to hold licensure through the Board of Medicine, including completion of a national certification exam or an approved training program. Regulations vary by state, but seeking out a licensed provider rather than an unregulated practitioner significantly lowers your odds of a preventable complication.
Before your session, tell the practitioner about any medications you take, especially blood thinners, and any skin conditions you have. Ask whether they use disposable equipment, particularly if wet cupping is involved. If a practitioner can’t clearly explain their sterilization practices or doesn’t ask about your medical history, that’s a reason to find someone else.
Frequency matters too. The serious complications in the medical literature almost always involve excessive or repeated sessions over a short period. Occasional cupping sessions with adequate recovery time between them carry a much lower risk profile than aggressive, frequent treatment schedules.
What the Evidence Says Overall
Cupping has a long history of use and a generally favorable safety record when practiced responsibly. The most common outcomes are temporary skin marks and mild soreness. Serious complications exist but are rare and overwhelmingly tied to practitioner error, lack of sterilization, or excessive treatment frequency. Dry cupping is the safer option, and wet cupping demands stricter hygiene standards due to blood exposure. If you’re otherwise healthy, not on blood thinners, and working with a licensed practitioner, cupping is a low-risk procedure for most people.