The Therapy That Leaves Bruises People Keep Coming Back For

Michael Phelps walked into the 2016 Rio Olympics covered in dark purple circles. Not bruises from training. Not some medical condition. He’d been cupped. By the next morning, Wikipedia’s page for “cupping therapy” had hit its highest traffic in history. Millions of people suddenly wanted to know what those marks were and why the most decorated Olympian alive was showing up to competition with them all over his back and shoulders.

That was almost a decade ago. Cupping never really went away after that moment. If anything, it spread further: into massage clinics, physical therapy offices, sports recovery centers, and wellness studios that had never offered it before. You can now book a session in most mid-sized cities without much effort. And the people who go back for it tend to go back regularly.

So what is it, exactly? And does it work? The honest answer to the second question is probably, for some things, with appropriate expectations. Cupping is a widely used muscle recovery method with a track record long enough to take seriously, even if the research is still catching up to the practice. Here’s what’s actually happening when a therapist places those cups on your skin.

The Basic Mechanics

Cupping works through suction. A therapist places cups made of glass, silicone, or plastic on specific areas of the body and creates a vacuum inside each one. That negative pressure pulls the skin and underlying soft tissue upward. Blood flow increases to the area. The lymphatic system responds. Fascial tissue, which wraps around your muscles and can become stuck or restricted after overuse or injury, gets lifted away from the layers beneath it rather than pressed down into them.

That last part is the key difference from massage. Cupping decompresses tissue instead of compressing it. Kevin Rindal, who worked with USA Swimming, described it as separating the layers of a flaky pastry so fluid can move more freely between them. The goal is mobility, not just pressure relief.

According to a review published in the Journal of Traditional and Complementary Medicine, researchers have proposed several theories to explain how cupping produces its effects. These include the Pain-Gate Theory, which relates to how the nervous system processes and modulates pain signals, and a Nitric Oxide theory linking suction to local muscle relaxation and changes in circulation. No single theory fully explains everything cupping appears to do. But it produces measurable physiological responses, even if those responses aren’t yet fully understood.

The Three Main Techniques

Dry cupping is the starting point for most people. Cups sit in place for five to ten minutes while the suction does its work. No incisions, no movement. It’s quiet, a little strange at first, and often surprisingly comfortable once you’ve been through it once.

Wet cupping involves small incisions before the cups go on, drawing a small amount of blood. It’s rooted in traditional Chinese and Middle Eastern medicine, where practitioners have long associated it with drawing out stagnant blood from affected tissue. Less common in Western clinics, but still practiced by trained specialists.

Massage cupping, sometimes called gliding cupping, combines suction with movement. Instead of staying in one spot, the cups are slid across the skin. It’s closer in feel to a deep-tissue massage, just working in the opposite direction.

Most people in wellness and recovery settings start with dry cupping and, if they respond well, experiment from there.

What the Research Actually Shows

Here’s where the honest caveat lives. Cupping research has grown significantly over the past fifteen years, but the evidence base is still developing. The NIH’s StatPearls database notes that cupping may help reduce pain intensity and support the body’s natural healing processes. Studies on neck pain, low back pain, and musculoskeletal conditions have shown promising short-term results compared to no treatment at all.

The harder question is how much of that is direct physiological effect and how much is placebo. It’s genuinely difficult to design a study that controls for placebos in cupping, because there’s no believable fake version of it. What researchers generally land on is this: the effects are real enough that people feel meaningfully better, the risks are low when done by a qualified practitioner, and the practice is worth exploring for people dealing with chronic tension or recovery needs.

What cupping probably won’t do: cure systemic disease or replace medical care for serious conditions. What it can do is address localized muscle tension, support circulation in a specific area, and help people who are stuck in a cycle of tightness and discomfort find some relief.

The Marks, and What They Say About Why People Trust This

The circular discolorations cupping leaves behind are unavoidable. They range from light pink to deep purple depending on how restricted the tissue was and how much suction was applied. They typically fade within a few days to a week. They’re not painful when pressed, and they’re not bruises in the conventional sense, though they look like them.

Some practitioners interpret the color as informative about circulation patterns in the treated tissue, though this isn’t scientifically standardized. What they are, practically, is visible evidence that something happened. And that might be part of why cupping has stuck around so stubbornly in an era that’s otherwise skeptical of wellness trends: you can see the result. In a market full of supplements and routines that produce no tangible feedback, cupping leaves a mark. People find that legible. There’s something to point to.

They do tend to get lighter with repeated sessions, which many regulars take as a sign the tissue is responding over time. Prepare to explain them to anyone who sees your back at the gym.

Who Gets the Most Out of It

Cupping tends to work best as part of a broader approach to recovery or pain management, not as a standalone fix. Athletes use it alongside massage and stretching. People with desk jobs use it to address the neck and upper back tension that builds up from hours of sitting. Those managing chronic pain often find it a useful complement to physical therapy.

It’s not right for everyone. People with certain skin conditions, bleeding disorders, or who are pregnant should consult a doctor before trying it. But for someone who has tried conventional massage and found it only goes so far, cupping offers something genuinely different in mechanism, sensation, and result.

The purple circles are just part of the deal.