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Myofascial Pain Syndrome – Causes and Treatment
Myofascial pain syndrome is a chronic pain condition affecting the muscles, characterized by sensitive pressure points known as trigger points that cause local and referred pain.
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Myofascial pain syndrome is a chronic pain condition affecting the muscles, characterized by sensitive pressure points known as trigger points that cause local and referred pain.
What Is Myofascial Pain Syndrome?
Myofascial pain syndrome (MPS) is a common chronic pain condition originating in the skeletal muscles and the surrounding connective tissue known as the fascia. The hallmark of the condition is the presence of locally hypersensitive spots within muscle tissue called myofascial trigger points. These are tight, palpable nodules within a taut band of muscle fiber that, when compressed or irritated, produce characteristic pain patterns -- often radiating to distant areas of the body in a phenomenon known as referred pain.
Myofascial pain syndrome can affect people of all ages and is one of the most common causes of musculoskeletal pain. While any muscle can be involved, the neck, shoulders, upper and lower back, and hips are the most frequently affected regions.
Causes
The exact causes of myofascial pain syndrome are not yet fully understood. Recognized contributing factors include:
- Acute muscle overload or repetitive microtrauma from monotonous or repetitive movements
- Poor posture and ergonomic strain, particularly in occupational settings
- Psychological stress and emotional tension, which can lead to involuntary muscle guarding
- Physical inactivity and muscle weakness
- Trauma such as sprains, strains, or accidents
- Underlying conditions including sleep disorders, thyroid dysfunction, or nutritional deficiencies (especially vitamin D and vitamin B12)
- Cold exposure or drafts as triggering factors in already sensitized muscles
Symptoms
The primary symptom of myofascial pain syndrome is persistent, dull, or aching muscle pain that can be difficult to localize precisely. Common symptoms include:
- Local tenderness at trigger points within the muscle
- Referred pain radiating to distant areas -- for example, headaches caused by trigger points in the neck muscles
- Restricted range of motion and stiffness in the affected muscle groups
- Muscle weakness without visible muscle wasting
- Sleep disturbances due to pain, particularly at night
- Associated symptoms such as tingling, numbness, or dizziness depending on the location of trigger points
Diagnosis
Myofascial pain syndrome is primarily a clinical diagnosis, as there are no specific laboratory markers or imaging findings that confirm the condition. Diagnosis is based on:
- Medical history: A thorough interview regarding the onset, character, and pattern of pain
- Physical examination: Systematic palpation of muscles to identify trigger points and reproduce the characteristic pain pattern
- Exclusion of other conditions: Imaging (MRI, ultrasound) and laboratory tests to rule out other disorders such as fibromyalgia, rheumatic diseases, or herniated discs
An important distinction must be made from fibromyalgia, which presents with more diffuse, generalized pain without discrete trigger points.
Treatment
Treatment of myofascial pain syndrome is multimodal and should be individually tailored. The following approaches have demonstrated clinical benefit:
Physical Therapy
- Manual trigger point therapy: Sustained pressure applied to trigger points to release muscle tension
- Physiotherapy and stretching: Targeted strengthening and flexibility exercises to restore normal muscle function
- Heat therapy: Application of local warmth to promote muscle relaxation
- TENS (Transcutaneous Electrical Nerve Stimulation): Electrical stimulation to reduce pain signals
Interventional Therapy
- Dry needling: Insertion of an acupuncture needle directly into the trigger point to release the taut muscle band
- Trigger point injections: Injection of local anesthetics (e.g., procaine, lidocaine) into the trigger point
Pharmacological Therapy
- Analgesics (NSAIDs such as ibuprofen or diclofenac) for short-term pain relief
- Muscle relaxants in cases of severe muscle spasm
- Antidepressants (e.g., amitriptyline) for chronic pain management
Complementary and Psychological Approaches
- Stress management and relaxation techniques (e.g., progressive muscle relaxation, yoga)
- Cognitive behavioral therapy for patients with chronic pain
- Acupuncture as a complementary treatment option
In the long term, a combination of active exercise therapy, stress reduction, and ergonomic improvements is the most effective strategy. Early treatment is essential to prevent the condition from becoming chronic.
References
- Simons D. G., Travell J. G., Simons L. S. - Myofascial Pain and Dysfunction: The Trigger Point Manual (1999), Williams and Wilkins, Baltimore.
- Fernandez-de-las-Penas C., Dommerholt J. - International Consensus on Diagnostic Criteria and Clinical Considerations of Myofascial Trigger Points. Pain Medicine, 2018; 19(1): 142-150.
- National Institute of Neurological Disorders and Stroke (NINDS) - Chronic Pain Information, National Institutes of Health (NIH), 2023. Available at: www.ninds.nih.gov
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