Does acupuncture hurt, and how does it work?

If you're thinking about trying acupuncture, two questions usually come up first: is it going to hurt, and what is it actually doing? Both are fair, and both have honest answers. Plenty of Canadians are curious about acupuncture without quite knowing what the needles feel like or how it's meant to work. This guide walks through what the needles are like, what most people feel during a session, whether it hurts, the common side effects and safety points, and the two very different ways acupuncture is explained — the traditional Chinese medicine picture and the Western neurophysiological one. We're not here to talk you into it or out of it. The goal is a clear picture so you can have a better conversation with a regulated health professional. If you'd like the wider overview first, our companion piece on what acupuncture is and what to expect covers the basics of a visit.

What the needles are actually like

The first thing to know is that acupuncture needles are not the needles you're picturing. The ones used for injections or blood draws are hollow and comparatively thick, because they have to carry fluid. Acupuncture needles are solid and extremely fine — often around the width of a couple of hairs. A practitioner inserts them through the skin at chosen points, and once they're in, the needles are usually left in place for roughly 10 to 30 minutes while you rest [2]. Some practitioners gently move or twirl the needles, and some use a mild electrical current, an approach called electroacupuncture [1].

Because the needles are so thin, most people are surprised by how little they feel on insertion — it's a different experience from a vaccination or a blood test.

What people feel: the "de qi" sensation

Once a needle is placed, many people notice a particular kind of feeling around the point. In traditional acupuncture this is called de qi, and practitioners often see it as a sign the needle is well placed. Researchers who have tried to pin down what de qi actually feels like describe it as a cluster of sensations — most commonly aching or soreness, numbness or tingling, heaviness, and a feeling of fullness, distension, or pressure [3]. You might feel it right at the needle, or feel it spread or radiate a little from the spot.

It's worth being honest about what this sensation means. Many practitioners believe that feeling de qi makes a treatment more effective, but researchers who reviewed the studies concluded that the link between de qi and how well acupuncture works is still controversial and not established [3]. So de qi is a real, commonly reported experience — not proof that anything therapeutic is happening. If you feel it, that's normal; if you don't, that's normal too.

Does it hurt?

For most people, acupuncture is not what they'd call painful. When a needle goes in you may feel a brief pinch, a dull ache, or a tingle, and then the de qi sensations described above [2][3]. Many people find the experience relaxing, and some feel a little tired or lightheaded afterward. Sharp, lasting, or genuinely painful sensations are not the goal, and they're worth mentioning to your practitioner right away — a needle can be adjusted or removed. Pain tolerance varies from person to person, so your experience might differ from a friend's.

Is it safe? Side effects and precautions

When it's done by a well-trained practitioner using single-use sterile needles, acupuncture is generally considered to carry a low risk of serious problems, and relatively few complications have been reported [1]. In Canada and many other countries, acupuncture needles are regulated as medical devices that must be sterile and labelled for single use, so a reputable practitioner opens a fresh, disposable needle for you and never reuses one [1].

The most common side effects are minor. Minor bleeding or bruising at the needle sites is the one people notice most; one source describes this happening in roughly 1 to 10 out of every 100 people, along with soreness around the points [2]. Serious complications are rare — one estimate puts them at fewer than 1 in 10,000 treatments — and when they do occur they are usually linked to needles that weren't sterile or to a practitioner who wasn't properly trained [2]. Delivered improperly, acupuncture can cause serious harm, including infections, a punctured organ such as a lung, or injury to the nervous system [1]. That's a big part of why choosing a qualified, regulated practitioner matters.

It's also sensible to tell your practitioner about your health beforehand — particularly if you're pregnant, take blood thinners, have a bleeding disorder, or have a pacemaker. None of that automatically rules acupuncture out, but it's information a good practitioner will want.

How is it thought to work?

Here's where honesty matters most, because acupuncture is explained in two quite different ways, and the underlying mechanism is not fully understood.

The traditional Chinese medicine picture is the older one. In this framing, a form of energy called qi is described as flowing through the body along channels known as meridians, and acupuncture is understood as adjusting that flow to support health [2]. This is how the practice has been described for a very long time, and many practitioners still use this language. It's important to be clear about what we're doing here: we're describing how the tradition explains its own work, not asserting that qi and meridians are established scientific facts. Whether these channels correspond to anything Western science can measure is a separate question, and one it hasn't confirmed.

The Western neurophysiological picture tries to explain acupuncture in terms the body's biology can be tested against. Research suggests that inserting and stimulating needles may affect the nervous system — brain-imaging studies have looked at how acupuncture influences areas involved in processing pain — and that it may prompt the release of the body's own natural painkillers, along with local effects in the tissue where the needle sits [1][4]. Some practitioners work explicitly from this model, sometimes called Western medical acupuncture [2].

But even this explanation comes with a large caveat. Many trials find that "real" acupuncture and "sham" acupuncture — a fake version using shallow needling or needles placed away from traditional points — produce similar results, which points toward a substantial placebo effect and the influence of a person's expectations [1][4]. In other words, part of what people experience may come from the ritual, attention, and belief around the treatment rather than the needling itself. Researchers are still sorting out how much is which. The fair summary is that no single, fully proven mechanism explains acupuncture, the evidence is mixed, and both the traditional and the biological accounts remain incomplete.

Finding a regulated practitioner in Canada

How acupuncture is regulated depends on where you live. It's overseen by a provincial college in some provinces and not others. British Columbia and Ontario regulate both traditional Chinese medicine practitioners and acupuncturists, while Alberta, Quebec, and Newfoundland and Labrador regulate acupuncturists [5]. In the regulated provinces, titles such as "Registered Acupuncturist" are protected, meaning a person has to meet the college's standards to use them [6]. In provinces without regulation, there's no single standard, so it's on you to check a practitioner's training and credentials [6].

Because of this patchwork, it's worth confirming how acupuncture is regulated in your province, choosing someone registered with the relevant college where one exists, and making sure they use single-use sterile needles. You can start by browsing acupuncture practitioners in our directory.

A reasonable next step

If you're curious about acupuncture, a sensible first move is a conversation with a licensed, regulated health professional — your family doctor, a physiotherapist, or a regulated acupuncturist. They can look at your particular situation, flag anything that needs different care, and help you weigh acupuncture alongside other options. General information can describe what to expect, but only a qualified professional can help you decide whether it's a reasonable fit for you.

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