Do Cupping and Dry Needling Actually Work? What the Evidence Says

Cupping leaves circular bruises. Dry needling involves pushing a solid needle an inch and a half into a muscle. Both are sold as healing. Neither has the evidence base their fans think it does, and the harms, while uncommon, are real enough that a Pittsburgh Steelers linebacker recently ended up in the hospital with a collapsed lung after a session.

Here is what the science actually supports, what it doesn't, and where the placebo effect is doing most of the heavy lifting.

Cupping: bruises, "toxins," and the argument from antiquity

The pitch you'll see on Instagram goes something like this: cupping has been done for 3,000 years, it improves blood flow and lymphatic drainage, it pulls out toxins, and it helps with everything from low back pain to migraines. Here's a representative version of that argument.

Most of it doesn't hold up. People have done plenty of things for thousands of years that turned out to be bad ideas, including bleeding patients for almost every disease. Antiquity is not evidence. The "toxins" claim is straight nonsense. Your kidneys filter about 100 milliliters of blood per minute, cycling your entire blood volume roughly 25 times a day. A suction cup on your back is not contributing to that.

There are three flavors of cupping. Dry cupping uses a vacuum pump to suck skin into a cup, which breaks capillaries and produces a bruise. Wet cupping adds a small skin incision so blood comes out. Fire cupping uses a lit alcohol-soaked swab to heat the air inside the cup, which then contracts as it cools and creates the vacuum. The cup marks people post about online are bruises. That is what they are.

The blood-flow claim is the one with some biological signal. A 2020 study using laser Doppler flowmetry showed roughly a 16-fold increase in local skin blood flow after cupping. That sounds dramatic until you realize you get a similar response from a sunburn or any other skin injury. Your body is good at directing blood to damaged tissue. Whether that translates to feeling better later is a different question, and one the data doesn't really answer.

What sham-controlled cupping trials show

The cleanest test is a sham-controlled trial, and sham cupping is genuinely hard to design. People notice when they end up covered in giant bruises versus when they don't. A 2021 trial in the Journal of Physiotherapy tried anyway. Ninety adults with non-specific low back pain were randomized to dry cupping or sham cupping (cups with a valve that let the vacuum leak out) for eight weekly sessions. Both groups improved modestly. There was no significant difference between them.

This is the pattern across the cupping literature. A lot of small studies in obscure journals show effects on subjective outcomes like pain. When sham controls are used, the difference shrinks or disappears. And the co-intervention problem is everywhere: the dark room, the soft music, the practitioner laying hands on you, the ritual of the appointment. Those are powerful in their own right, and they get bundled into the "cupping" effect.

Cupping harms are uncommon but not zero

Most cupping bruises are cosmetic and harmless. Repeated cupping can leave permanent iron staining of the skin and, in people prone to keloids, raised scars. Wet cupping carries infection risk because you've cut the skin. Fire cupping carries burn risk for obvious reasons.

The serious one is subdural hematoma, a bleed between the brain and the skull. There are three case reports of this from cupping on the neck and base of the skull, where small veins running up to the brain can tear under the suction. Rare, but worth knowing about if a practitioner wants to cup your occiput for neck pain.

Dry needling: what it is and whether knots exist

Dry needling looks a bit like acupuncture, but the needle goes much deeper, about an inch and a half compared to a few millimeters. "Dry" means there's no injection. You're just putting a solid needle into muscle. Some versions add electrical stimulation through the needles to make the muscle contract.

The usual rationale is that you're hitting a trigger point, the "muscle knot" you can sometimes feel under the skin, and that the needle releases it. Whether trigger points are a real, imageable thing is genuinely unclear. A small MRI study of 10 people with migraine-associated trigger points found that the practitioner palpated the points, marked them, and then the MRI showed only subtle differences (T2 values of about 32 to 33 ms over the trigger points versus 28 to 29 ms in normal trapezius muscle). A nine-person ultrasound study of myofascial pain syndrome found "focal areas of reduced vibration amplitude" at trigger points. None of the imaging tests perform well compared to a practitioner's fingers. There are no validated tests.

The biology of an always-contracted muscle "knot" is also strange. Muscles contract until they run out of ATP, then they stop. A permanently contracted bundle doesn't fit that picture neatly. The more honest mechanism for dry needling is probably: you're poking tissue, that recruits a healing response, and pain can dampen other pain in the short term.

What the dry needling trials actually show

For neck pain, sham-controlled studies have not shown dry needling to beat sham. A 2024 trial in the Journal of Orthopaedic and Sports Physical Therapy compared dry needling directly to manual therapy (massage) in 78 adults with mechanical neck pain. Manual therapy won.

For knee osteoarthritis, the largest trial (n=242) in the Clinical Journal of Pain looked impressive: 75% of patients getting electrical dry needling plus manual therapy and exercise had a successful outcome at three months, versus 18% in the manual therapy and exercise group. But there was no sham control, and dry needling was layered on top of exercise. If the needling made people feel good enough to exercise more, you're capturing both effects. Knee pain is also famously placebo-sensitive. Sham knee surgery often does about as well as real knee surgery.

For shoulder pain, a small sham-controlled trial in Pain Reports with 20 people per group showed a modest, borderline-significant benefit. For headache, a few small sham-controlled trials show modest effects. These are not blockbusters.

Dry needling harms: mostly minor, occasionally a collapsed lung

A 2026 systematic review of 59 studies found minor adverse events are common, occurring in 0 to 48% of treatments. Those are mostly bleeding, bruising, and transient pain. Major adverse events occur in 0 to 0.43% of treatments and include pneumothorax, nerve injury, syncope, and infection.

Pneumothorax is the one to worry about. The top of the lung sits closer to the surface of the upper back and neck than most people assume. In a case series of malpractice claims related to trigger point injections, 15 of 17 serious complications were pneumothoraces. In December 2025, Steelers linebacker TJ Watt was hospitalized with a collapsed lung after dry needling in his trapezius. If you're going to do this, do not do it near the top of the chest or the base of the neck.

The bottom line

Cupping is mostly placebo plus a nice quiet room, with bruises as a bonus. The best sham-controlled trial in low back pain showed no benefit over fake cupping. The "toxins" story is nonsense. I'd skip it. If you like the ritual and you stick to dry cupping away from your neck, you're not likely to hurt yourself, but you're not getting much either.

Dry needling is more interesting. Some sham-controlled trials show modest effects for shoulder pain and headache, and one large (unblinded) trial in knee osteoarthritis is genuinely positive. The mechanism is murky, "muscle knots" may not be quite what we think they are, and the pneumothorax risk is real. If you believe in it and it helps you, and you keep the needles away from your upper chest and neck, the risk-benefit isn't terrible. If you don't believe in it, get a massage.

Here's the "What's the deal with cupping and dry needling?" segment from the episode:

I covered this in depth on Wellness, Actually, listen below.

Wellness, Actually Podcast

"What's the deal with cupping and dry needling?" — Listen to the full episode, including the week's health news and listener Q&A.