What Is a Trigger Point?
A trigger point is a hyperirritable spot within a taut band of skeletal muscle — what most patients call a “knot.” But it’s more specific than just a tight muscle. A trigger point is a focal area of dysfunctional muscle tissue that is painful under direct pressure and, critically, refers pain to a predictable distant location. That referral pattern is the distinguishing feature. Press on a trigger point in the upper trapezius and the patient will often feel pain at the base of the skull, behind the eye, or along the side of the neck — even if you’re pressing nowhere near those locations.
Trigger points exist in two forms: active and latent. Active trigger points cause pain at rest or with movement and are what most people are experiencing when they come into the clinic complaining of muscle pain. Latent trigger points are only painful when pressed — they’re not generating symptoms spontaneously but they can still restrict motion and contribute to movement dysfunction. The foundational research mapping trigger points and their referral patterns was done by Dr. Janet Travell and Dr. David Simons, whose work in the 1980s established the systematic reference that clinicians still use today.
What Causes Trigger Points?
The most common cause of trigger points is overuse and repetitive strain — sustained muscle contraction from poor posture, repetitive work tasks, or sport. A desk worker holding their neck and shoulders in a forward-head posture for eight hours a day, a runner overloading their calf muscles through high mileage without adequate recovery, a construction worker doing the same motion hundreds of times per shift: these are the environments where trigger points develop. The muscle is working harder than its capacity allows, or it’s sustaining low-level contraction without adequate rest, and the result is dysfunction at the motor endplate level.
Other contributing factors include acute muscle strain or trauma, sustained psychological stress (which produces real, documented increases in muscle tension), deconditioning (weak muscles working above their capacity to compensate), and poor sleep and metabolic factors that impair muscle recovery. The most common locations in the clinic: upper trapezius, levator scapulae, quadratus lumborum, piriformis, gluteus medius, and gastrocnemius. These are the muscles that take the most sustained low-level loading in a sedentary, sitting-dominant population — and they’re the muscles we address most frequently.
What Is Trigger Point Therapy?
Trigger point therapy is an umbrella term for manual and needling techniques that directly address trigger points. Three approaches are used most commonly in physical therapy practice.
Manual trigger point release (also called ischemic compression) involves the PT applying sustained, direct pressure to the trigger point — enough pressure to cause controlled discomfort, held until the tissue releases. The “release” is a palpable change in tissue tension under the clinician’s hand, and most patients describe the sensation as the pressure suddenly feeling less intense, or the local knot seeming to soften. It’s safe, requires no tools, and provides immediate feedback to both the clinician and the patient about tissue response.
Myofascial release is a broader technique that addresses the fascial network surrounding muscle — including trigger point work but also longer, sweeping techniques that address the connective tissue environment, not just the focal knot. It’s particularly useful when trigger points are part of a larger pattern of fascial restriction rather than isolated points.
Dry needling is the most direct intervention and often the most effective for deep or persistent trigger points. A thin filiform needle is inserted directly into the trigger point, eliciting a local twitch response — a brief, involuntary muscle contraction that appears to reset the dysfunctional motor endplate. The twitch response is what you’re aiming for; it indicates the needle has engaged the trigger point, and it’s followed by a characteristic feeling of release or ease in the tissue. Dry needling is performed by trained PTs and is legal in Massachusetts. It’s not acupuncture — the mechanism and theoretical basis are different, though the tools look similar.
What Does Trigger Point Therapy Feel Like?
Manual compression feels like a “good hurt” — pressure that is uncomfortable but productive. Most patients can immediately feel that something is happening in the tissue, and the most common response is that they want the clinician to keep going even though it’s uncomfortable. The discomfort is localized to the pressure point and, often, the referral zone. When the tissue releases, the pressure sensation typically diminishes noticeably, even with the same amount of force applied.
With dry needling, the local twitch response feels like a brief, intense cramp — sharp and sudden, resolving within a second or two. After the twitch, most patients describe a feeling of release, warmth, or diffuse heaviness in the area. Post-treatment soreness lasting 12 to 48 hours is common — it feels like the delayed-onset muscle soreness you’d get after a hard workout, and it’s not a sign that anything went wrong. It’s a normal tissue response to the intervention. Trigger point therapy is effective for cervicogenic headaches, upper trapezius pain, low back trigger point referral patterns, gluteal and hip pain, and conditions like plantar fasciitis where trigger points in the calf and intrinsic foot muscles contribute to the pain picture.
Is Trigger Point Therapy Enough on Its Own?
No — and this is the most important thing to understand about trigger point therapy. It is a technique, not a treatment plan. Releasing a trigger point provides meaningful relief and can change a patient’s pain experience significantly. But if you don’t address the underlying cause — the posture that’s overloading the upper trapezius, the hip weakness that’s overloading the piriformis, the running form issue that’s overloading the gastrocnemius — the trigger point will return. The next session, or the one after that, you’ll be releasing the same knot again.
The most effective use of trigger point therapy is as one component of a comprehensive treatment plan that includes corrective exercise targeting the movement dysfunction or weakness driving the trigger point, postural and ergonomic modification, activity load management, and patient education. The PT’s job is not just to release the knot each session — it’s to identify and address why the knot keeps forming, and to give the patient the tools to prevent it from coming back.
Persistent muscle knots, referred pain, or tension headaches that won’t resolve on their own often have trigger point involvement at their root. Joint Ventures PT offers trigger point therapy including dry needling at locations across the Boston area. Book an evaluation.
Dr. Erin Forsythe is a physical therapist at Joint Ventures Physical Therapy. She specializes in orthopedic and sports physical therapy, with clinical expertise in manual therapy, dry needling, and myofascial treatment approaches for musculoskeletal pain.
