Myofascial Trigger Points: Causes, Symptoms and Care

Myofascial trigger points (MTrPs) represent one of the most common and often unrecognized causes of musculoskeletal pain. These hypersensitive points, located within a taut band of skeletal muscle, can generate local and referred pain, motor dysfunction, and autonomic symptoms. Understanding them is fundamental for healthcare professionals and for anyone suffering from persistent pain that lacks a clear explanation. With over three decades of clinical experience, it is evident how the identification and effective treatment of myofascial trigger points can make a substantial difference in patients’ quality of life. This article aims to deeply explore what trigger points are, how they manifest, how they are diagnosed, and what the most effective treatment strategies are, providing a comprehensive and evidence-based guide.

Table of Contents

• What Are Myofascial Trigger Points?
• Causes and Contributing Factors
• Symptoms and Clinical Manifestations
• Myofascial Trigger Point Maps
• Diagnosis of Myofascial Trigger Points
• Physiotherapy Treatment of Myofascial Trigger Points
• Prevention of Myofascial Trigger Points
• Read Also:Kinesio Taping: Does It Really Work? Evidence and UsesRead Also:Hydrotherapy and Water Rehabilitation: BenefitsFrequently Asked Questions (FAQ)
• Resources
• Sources and Scientific References
• Frequently Asked Questions

What Are Myofascial Trigger Points?

A myofascial trigger point is defined as a focal, hyperirritable spot within a palpable taut band of skeletal muscle, painful upon compression, and which can evoke characteristic referred pain, tenderness to palpation, and/or motor dysfunction. This definition, coined and extensively studied by pioneers Dr. Janet Travell and Dr. David Simons, laid the groundwork for understanding this condition.

There are two main types of trigger points:

• Active Trigger Points: Cause spontaneous pain or pain upon compression, with a referred pain pattern that the patient recognizes as their own symptom. They can limit movement and cause muscle weakness.
• Latent Trigger Points: Do not cause spontaneous pain, but are painful upon compression and may produce referred pain not recognized by the patient as their usual symptom. They can still cause muscle dysfunction, such as stiffness or reduced range of motion, and can easily become active following stress or overload.

Pathophysiology of Myofascial Trigger Points

The pathogenesis of myofascial trigger points is complex and not fully understood, but the most accepted theory is the integrated hypothesis of Travell and Simons. This theory suggests that a trigger point develops due to a dysfunction of the neuromuscular junction, where an excessive release of acetylcholine leads to a sustained contraction of some muscle fibers (sarcomeres). This localized contraction forms the palpable “taut band” and compresses local blood vessels, creating an area of ischemia and hypoxia.

Ischemia and hypoxia lead to a local energy crisis, as muscle cells cannot produce enough ATP to relax. This, in turn, stimulates the release of algogenic substances (such as bradykinin, serotonin, histamine, potassium, prostaglandins, and substance P), which sensitize nociceptive nerve endings, generating pain. Pain and neurogenic inflammation can perpetuate the cycle, keeping the trigger point active.

Recent studies have used techniques such as ultrasound and elastography to visualize trigger points, showing alterations in muscle tissue structure and stiffness. Although palpation remains the diagnostic gold standard, these technologies are contributing to a more objective understanding of their nature.

Causes and Contributing Factors

The etiology of myofascial trigger points is multifactorial and often involves a combination of predisposing and precipitating factors. Understanding these causes is crucial for effective treatment and prevention of recurrence.

Direct Triggering Factors:

• Acute Trauma (Macrotrauma): A single traumatic event, such as a fall, a car accident (e.g., whiplash) or a sports injury, can cause sudden overload and the activation of trigger points.
• Chronic Muscle Overload (Repetitive Microtrauma): Repetitive activities or sustained postures for long periods (e.g., computer work, weightlifting, specific sports) can cause an accumulation of stress on a muscle, leading to trigger point formation. This is particularly common in postural muscles.
• Poor Posture: Maintaining non-ergonomic postures for prolonged periods increases the load on specific muscle groups, predisposing them to trigger point development.
• Muscle Imbalances: Weakness or excessive tension in some muscles compared to others can alter joint and muscle biomechanics, favoring MTrP formation.

Predisposing and Perpetuating Factors:

• Psychological and Emotional Stress: Chronic stress, anxiety, and depression can increase general muscle tension and lower the pain threshold, making individuals more susceptible to trigger point development and maintenance.
• Sleep Disturbances: Insufficient or poor-quality sleep prevents muscle recovery and can exacerbate pain and muscle tension, contributing to MTrP persistence.
• Nutritional Deficiencies: Deficiency of essential vitamins and minerals, such as magnesium, calcium, potassium, vitamin D, and B vitamins, can impair muscle and nerve function, affecting the muscle’s ability to relax and recover.
• Metabolic and Endocrine Conditions: Diseases such as hypothyroidism, diabetes, anemia, and adrenal dysfunctions can affect muscle metabolism and pain response, making muscles more vulnerable.
• Chronic Infections and Inflammation: Chronic inflammatory conditions or systemic infections can contribute to a pro-inflammatory environment that favors trigger point development.
• Joint Dysfunctions: Limited joint movement or instability can alter movement patterns and overload surrounding muscles, activating trigger points.
• Radiculopathies and Nerve Compression: Compression of a nerve root can cause muscle weakness and dysfunction, making the muscle more susceptible to trigger point formation.
• Structural Factors: Leg length discrepancies, scoliosis, or other structural abnormalities can alter body biomechanics and create abnormal muscle tensions.

Effective management of myofascial trigger points requires careful evaluation of all these factors, as treatment cannot be long-lasting if underlying causes are not addressed.

Symptoms and Clinical Manifestations

Myofascial trigger points can present with a wide range of symptoms, extending beyond simple local pain. Their ability to refer pain and influence muscle and nerve function makes them a complex condition to diagnose and treat.

Local and Referred Pain:

The cardinal symptom of trigger points is pain.

• Local Pain: Pain is felt directly at the location of the trigger point, often described as a dull, deep pain, or a burning or tension sensation.
• Referred Pain: This is a distinctive characteristic of trigger points. Pain is not felt at the point of origin, but in a distant area, often following specific and predictable patterns (as mapped by Travell and Simons). Referred pain can be constant or intermittent and may be perceived as dull, sharp, or burning. For example, a trigger point in the upper trapezius muscle can cause headaches or pain at the temple, while a trigger point in the gluteus medius can refer pain down the leg, mimicking sciatica.

Muscle Dysfunction:

• Muscle Weakness: The muscle affected by trigger points may show a reduced ability to generate force, not due to structural damage, but through a reflex inhibitory mechanism.
• Reduced Range of Motion (ROM): The taut band and associated pain can limit the muscle’s ability to lengthen completely, reducing the ROM of the involved joint.
• Muscle Stiffness and Tension: The muscle may feel constantly tense and rigid, especially in the morning or after periods of inactivity.
• Fatigue: The muscle may tire more quickly during activity.

Autonomic Symptoms:

Trigger points can activate the autonomic nervous system, leading to a variety of unexpected symptoms:

• Vasoconstriction or Vasodilation: Alterations in local blood flow, with skin that may appear pale or flushed.
• Local Sweating: Increased sweating in the referred pain area.
• Piloerection: “Goosebumps”.
• Lacrimation, Runny Nose, Salivation: Particularly common with trigger points in the neck or face (e.g., sternocleidomastoid).
• Dizziness or Imbalance: Neck trigger points can affect proprioception and cause sensations of dizziness or instability.
• Tinnitus: Rarely, trigger points in the neck or masticatory muscles may be associated with tinnitus.

Proprioceptive Disturbances:

• Alterations in body position sense, which can contribute to balance and coordination problems.

Sleep Disorders:

Persistent pain and muscle tension can interfere with sleep, leading to insomnia or non-restorative sleep, which in turn can perpetuate trigger points.

Impact on Quality of Life:

The combination of pain, dysfunction, and other symptoms can have a significant impact on the ability to perform daily, work, and recreational activities, reducing quality of life and contributing to psychological stress.

The complexity of symptoms requires a careful and differentiated diagnostic approach to exclude other pathologies with similar presentations.

Myofascial Trigger Point Maps

The “map” of myofascial trigger points refers to the characteristic referred pain patterns associated with specific muscles. This mapping, developed primarily by Travell and Simons, is an invaluable diagnostic tool for clinicians, as it allows correlation between trigger point location and the patient’s perceived pain site. Understanding these patterns is fundamental for identifying the source of pain, even when the patient indicates an area distant from the affected muscle.

Below are some examples of common muscles and their referred pain patterns:

• Upper Trapezius Muscle: One of the most frequently involved muscles. Trigger points in this muscle can refer pain to the temporal region (causing tension headaches), neck, skull base, and shoulder. They can also cause neck stiffness and limited rotation.
• Sternocleidomastoid Muscle (SCM): Trigger points in the SCM can cause a wide range of symptoms, including frontal headaches, ear pain, dizziness, blurred vision, tearing, runny nose, and jaw pain.
• Levator Scapulae Muscle: Trigger points in this muscle can refer pain to the upper angle of the scapula, neck, and shoulder, limiting neck rotation.
• Infraspinatus Muscle: A trigger point in this rotator cuff muscle can cause deep shoulder pain that radiates down the arm to the forearm and hand, often mimicking cervical radiculopathy. It can limit external shoulder rotation.
• Gluteal Muscles (Medius and Minimus): Trigger points in the gluteus medius and minimus are a common cause of low back pain and pain that radiates along the lateral thigh and calf, often confused with sciatica. They can also cause hip pain.
• Quadratus Lumborum Muscle: Trigger points in this deep muscle of the lumbar region can cause intense and deep pain in the lower back, hip, and sometimes groin or upper thigh. Pain may be aggravated by coughing or sneezing.
• Piriformis Muscle: A trigger point in the piriformis can cause gluteal pain and, if it compresses the sciatic nerve, can produce sciatica-like symptoms (pain, numbness, tingling along the posterior thigh and calf).
• Gastrocnemius and Soleus Muscles (Calf): Trigger points in these muscles can cause calf, heel, and plantar foot pain, often associated with nocturnal cramps or morning stiffness.
• Scalene Muscles: Trigger points in the scalene muscles can refer pain to the chest, shoulder, along the arm and to the hand, often accompanied by numbness and tingling, mimicking thoracic outlet syndrome or cervical radiculopathy.
• Pectoralis Major and Minor Muscles: Trigger points in these muscles can cause chest, shoulder, and arm pain, sometimes confused with cardiac pain (angina).

It is important to emphasize that knowledge of these maps does not replace thorough clinical evaluation. Each individual may present variations in referred pain patterns, and the presence of multiple trigger points in different muscles can complicate the clinical picture. The ability to identify and treat these points requires deep knowledge of musculoskeletal anatomy and expert palpation.

Diagnosis of Myofascial Trigger Points

The diagnosis of myofascial trigger points is predominantly clinical and based on detailed patient history and thorough physical examination. There are no laboratory or imaging tests that can definitively confirm the presence of a trigger point, although some advanced techniques are emerging.

Detailed History:

Your doctor or physical therapist will collect comprehensive information about the patient’s clinical history, including:

• Pain Location and Characteristics: Where does the pain occur? Is it dull, sharp, burning? Is it constant or intermittent?
• Aggravating and Alleviating Factors: What makes the pain worse or better? (e.g., specific movements, postures, stress, rest).
• Referred Pain Pattern: Does the pain radiate to other areas? Does the patient recognize this pain as their usual symptom?
• Associated Symptoms: Are there stiffness, weakness, numbness, tingling, dizziness, or autonomic symptoms?
• History of Trauma or Overload: Recent traumatic events or repetitive activities.
• Predisposing Factors: Stress, sleep disorders, nutrition, pre-existing medical conditions.
• Previous Treatments: Which therapies have been tried and with what outcome?

Physical Examination:

Physical examination is the cornerstone of diagnosis and requires expert palpation.

• Inspection: Assessment of posture, asymmetries, and presence of visible contractures.
• Range of Motion (ROM) Assessment: Active and passive ROM measurement of involved joints to identify limitations.
• Muscle Palpation: This is the most critical phase. The clinician will palpate the muscle looking for:

• Palpable Taut Band: A rope or band of muscle tissue that is more rigid and taut compared to surrounding tissue.

• Hyperirritable Spot (Nodule): Within the taut band, a specific point extremely sensitive to pressure will be identified.

• Local Compression Pain: Pressure on the nodule evokes local pain.

• Recognized Referred Pain: Pressure on the nodule reproduces the referred pain pattern that the patient recognizes as their usual symptom (for active trigger points).

• Local Twitch Response (LTR): An involuntary and transient contraction of muscle fibers in the taut band, which can be observed or palpated when the trigger point is mechanically stimulated (e.g., with palpation or with a needle in dry needling). This is considered one of the most reliable characteristics.
• Muscle Strength Testing: To assess associated weakness.
• Neurological Tests: To exclude nerve compressions or other neurological pathologies that could mimic trigger point symptoms.

Diagnostic Criteria (Travell & Simons):

Major criteria for diagnosing an active trigger point include:

• Palpable taut band.
• Hypersensitive spot (nodule) within the taut band.
• Referred pain recognized by the patient.
• Local twitch response (LTR) to trigger point stimulation.

Minor criteria include:

• ROM limitation.
• Muscle weakness without atrophy.
• Autonomic symptoms.

Differential Diagnosis:

It is essential to distinguish myofascial trigger points from other conditions that can cause musculoskeletal pain, including:

• Radiculopathies (disc herniation, spinal stenosi (restringimento del canale vertebrale o vascolare)s).
• Arthropathies (osteoarthritis, arthritis).
• Tendinopathies and bursitis.
• Fibromyalgia (characterized by widespread pain and tender points, but without the taut bands and specific referred pain patterns of MTrPs).
• Peripheral neuropathies.
• Thoracic outlet syndrome.
• Visceral problems (e.g., angina pectoris, renal colic).

Accurate diagnosis requires significant clinical experience and the ability to integrate all collected information. In case of doubts, your doctor or physical therapist may request additional investigations to exclude other pathologies.

Physiotherapy Treatment of Myofascial Trigger Points

Treatment of myofascial trigger points aims to deactivate the hypersensitive point, restore normal muscle length and function, reduce pain, and prevent recurrences. A multimodal and personalized approach is often most effective.

Treatment Objectives:

• Trigger Point Deactivation: Release the taut band and nodule.
• Pain Reduction: Alleviate local and referred pain.
• Restore Muscle Function: Improve strength, flexibility, and range of motion.
• Address Contributing Factors: Address underlying causes to prevent new trigger point formation.
• Patient Education: Provide tools for self-management and prevention.

Manual Techniques:

These are often the first line of treatment and require the skill of an experienced physical therapist.

• Ischemic Compression (Acupressure): Application of constant, deep pressure directly on the trigger point. Pressure is maintained until pain diminishes (generally 30-90 seconds). The goal is to create local ischemia followed by reactive hyperemia, which helps “reset” the muscle.
• Stripping (Deep Massage): Application of deep, sliding pressure along the muscle’s taut band, from the trigger point toward the muscle insertion. This technique aims to “break” adhesions and improve circulation.
• Myofascial Release: Techniques that aim to release restrictions in the connective tissue (fascia) that surrounds muscles. Sustained pressure and slow stretching are applied to lengthen the fascia and muscle.
• Dry Needling: An advanced technique where a thin, sterile needle is inserted directly into the trigger point to elicit a local twitch response (LTR). The LTR is associated with trigger point release and pain reduction. This technique requires specific training and must be performed only by qualified professionals. Scientific evidence supports the effectiveness of dry needling in pain reduction and functional improvement.
• Spray and Stretch: Consists of applying a cooling spray (e.g., fluoromethane) to the skin over the trigger point, immediately followed by passive muscle stretching. The cold acts as a counter-irritant, temporarily reducing pain and allowing more effective stretching.

Instrumental Physical Therapies:

Can be used as adjuvants to reduce pain and inflammation.

• Therapeutic Ultrasound: Can help reduce inflammation and improve local circulation.
• Laser Therapy (LLLT): Low-level laser can promote tissue healing, reduce pain and inflammation.
• TENS (Transcutaneous Electrical Nerve Stimulation): Used for pain management, blocking painful nerve signals.
• Shockwave Therapy (ESWT): Extracorporeal shockwaves can be effective for chronic and deep trigger points, stimulating tissue regeneration and reducing pain.

Therapeutic Exercises:

Exercises are fundamental for maintaining results and preventing recurrences.

• Specific Stretching: Once the trigger point has been deactivated, it is crucial to stretch the muscle to restore its normal length and prevent reactivation. The physical therapist will teach appropriate stretching techniques for the involved muscles.
• Strengthening Exercises: Often muscles with trigger points are weak or imbalanced. Targeted exercises to strengthen antagonist or synergistic muscles can help correct imbalances and improve stability.
• Postural Exercises: Postural correction is essential to reduce load on muscles predisposed to trigger points.
• Joint Mobility Exercises: Maintaining good mobility of nearby joints can reduce stress on muscles.
• Motor Control Exercises: Re-educating the body to move efficiently and without compensations.

Patient Education and Lifestyle Modifications:

• Ergonomics: Advice on how to adapt the work environment and daily activities to reduce muscle stress.
• Stress Management: Relaxation techniques, mindfulness, yoga can help reduce stress-induced muscle tension.
• Hydration and Nutrition: Ensure adequate hydration and balanced diet to support muscle health.
• Sleep Quality: Improve sleep hygiene to promote muscle recovery.
• Self-treatment: Teaching the patient simple self-treatment techniques (e.g., ball massage, stretching) to manage symptoms between sessions.

Multidisciplinary Approach:

In complex or chronic cases, a multidisciplinary approach involving the attending physician, physical therapist, psychologist (for stress and chronic pain management), and other specialists may be necessary to achieve the best results.

It is essential that treatment be supervised by your doctor or physical therapist, who can accurately assess the condition and propose the most appropriate treatment plan.

Prevention of Myofascial Trigger Points

Prevention is a crucial aspect in the long-term management of myofascial trigger points. Adopting a healthy and conscious lifestyle can significantly reduce the risk of developing or reactivating these painful points.

• Maintain Good Posture:

• Whether standing or sitting, it is essential to maintain correct alignment of the spine.

• Use ergonomic chairs and lumbar supports if necessary.

• Avoid maintaining the same position for prolonged periods; take frequent breaks to move and change posture.

• Regular and Balanced Physical Exercise:

• Include strength, flexibility, and cardiovascular exercises in the routine.

• Focus on strengthening weak muscles and stretching tight muscles to correct muscle imbalances.

• Perform adequate warm-up before physical activity and post-workout stretching.

• Stress Management:

• Stress is a common trigger for muscle tension. Practice relaxation techniques such as deep breathing, meditation, yoga, or tai chi.

• Dedicate time to pleasant and relaxing activities.

• Balanced Nutrition and Adequate Hydration:

• A diet rich in fruits, vegetables, lean proteins, and whole grains provides essential nutrients for muscle health.

• Ensure adequate intake of magnesium, potassium, calcium, and B and D vitamins, which are crucial for muscle and nerve function.

• Drink plenty of water throughout the day to keep tissues hydrated and promote toxin elimination.

• Adequate and Restorative Sleep:

• Sleep 7-9 hours per night in a comfortable and dark environment.

• Use a mattress and pillow that adequately support the spine.

• Good sleep quality is essential for muscle recovery and inflammation reduction.

• Avoid Overloads and Repetitive Movements:

• Be aware of your body’s limits.

• Alternate tasks requiring repetitive movements with others involving different muscle groups.

• Use correct lifting techniques to avoid injuries.

• Workplace and Home Ergonomics:

• Adjust workstation (chair height, monitor, keyboard) to maintain neutral posture.

• Use tools and equipment that reduce muscle effort.

• Regular Check-ups:

• Regularly consult your doctor or physical therapist for postural and muscular evaluations, even in the absence of pain, to identify and correct dysfunctions early.

Adopting these preventive practices not only helps avoid myofascial trigger point formation, but also contributes to general wellbeing and better quality of life.

Read Also: Kinesio Taping: Does It Really Work? Evidence and Uses

Read Also: Hydrotherapy and Water Rehabilitation: Benefits

Frequently Asked Questions (FAQ)

What distinguishes a trigger point from a simple muscle knot or contracture?

A “muscle knot” or “contracture” are generic terms that may describe an area of muscle tension. A myofascial trigger point is a more specific and clinically defined condition: it is a focal, hyperirritable spot within a palpable taut band of skeletal muscle. Its distinctive characteristic is the ability to evoke distant referred pain and, often, a local twitch response to palpation. While a contracture may be diffuse tension, the trigger point is a precise spot within that tension with specific symptoms.

Can trigger points cause pain in other parts of the body?

Yes, this is one of the most important and often misunderstood characteristics of myofascial trigger points. Trigger points are known for their ability to evoke pain in areas distant from where they are located. This phenomenon is called “referred pain” and follows specific patterns for each muscle, as mapped by Travell and Simons. For example, a trigger point in the upper trapezius muscle can cause headaches or temple pain, while one in the gluteus can refer pain down the leg.

Is dry needling painful?

Dry needling can cause discomfort or pain during the procedure, especially when the needle enters the trigger point and provokes the local twitch response (LTR). This sensation is often described as a muscle cramp or shock. However, the pain is generally brief and transient. Many patients report significant relief from pain and muscle tension immediately after treatment, despite the initial discomfort. The procedure must be performed by a specifically trained and qualified physical therapist or physician. For more information, consult the guide on Dry Needling: What It Is and When It’s Useful.

How long does it take to treat a trigger point?

The time needed to treat a trigger point varies considerably depending on several factors, including the chronicity of the trigger point, the number of trigger points present, the presence of perpetuating factors, and the individual patient’s response to treatment. Acute trigger points may resolve in a few sessions, while chronic ones or those associated with complex conditions may require a longer treatment cycle, often weeks or months, with a multimodal approach that includes manual therapies, exercises, and lifestyle modifications.

Can I treat trigger points myself?

While some self-treatment techniques, such as heat application, gentle stretching, or use of myofascial rollers and massage balls, can offer temporary relief for latent or less severe trigger points, it is essential to consult your doctor or physical therapist for accurate diagnosis and a personalized treatment plan. Active, deep, or complex trigger points require intervention by a qualified professional who can correctly identify them and apply specific techniques such as ischemic compression or dry needling safely and effectively.

Are trigger points related to fibromyalgia?

Yes, there is a correlation between myofascial trigger points and fibromyalgia, but they are not the same thing. Fibromyalgia is a chronic widespread pain syndrome, characterized by generalized musculoskeletal pain, fatigue, sleep disturbances, and specific tender points. Myofascial trigger points, on the other hand, are specific points within muscle taut bands that cause local and referred pain. Many fibromyalgia patients also have myofascial trigger points, and treating the latter can contribute to reducing overall pain. However, fibromyalgia is a more complex condition involving central pain sensitization mechanisms, while trigger points are primarily a local muscle problem.

Sources and Scientific References

1. Shah JP, Thaker N, Heimur J, Aredo JV, Sikdar S, Gerber L. Myofascial Trigger Points Then and Now: A Historical and Scientific Perspective. PM R. 2015;7(7):746-
2. DOI: 10.1016/j.pmrj.2015.01.024
3. Fernández-de-las-Peñas C, Dommerholt J. International Consensus on Diagnostic Criteria and Clinical Considerations of Myofascial

Frequently Asked Questions

What exactly is a myofascial trigger point?

A myofascial trigger point is a focal, hyperirritable spot located within a palpable taut band of skeletal muscle. It is painful upon compression and can cause local tenderness, characteristic referred pain, or motor dysfunction.

What is the difference between an active and a latent trigger point?

Active trigger points cause spontaneous pain and referred pain that the patient recognizes as their usual symptom, often limiting movement. Latent trigger points do not cause spontaneous pain but are painful upon compression, potentially causing stiffness or reduced range of motion.

How do myofascial trigger points develop?

Trigger points typically develop from excessive muscle contractions, which create taut bands within the muscle and reduce local blood flow. This process is thought to involve a dysfunction at the neuromuscular junction, leading to persistent muscle contraction and pain.

What kind of symptoms can myofascial trigger points cause?

Beyond local and referred pain, trigger points can cause muscle dysfunction such as stiffness, weakness, or reduced range of motion. They can also contribute to autonomic symptoms, proprioceptive disturbances, and sleep disorders, significantly impacting quality of life.

How does physiotherapy help treat myofascial trigger points?

Physiotherapy treatment for trigger points often includes manual techniques like compression or massage, therapeutic exercises to restore function, and instrumental physical therapies. Patient education on lifestyle modifications and prevention is also a key component to reduce persistent pain and improve movement.