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The trapezius muscle is a large muscle in the upper back, extending from the back of the head and neck, across the shoulders, and down the middle of the back. It is commonly referred to as the trap muscle and plays a crucial role in various movements and maintaining posture. While it is less prone to injuries compared to other muscles, trap muscle strains and injuries can occur, resulting in pain, limited mobility, and muscle weakness. These injuries can be acute, caused by trauma or overuse, or chronic, resulting from repetitive low-impact activities. Additionally, nerve entrapment can cause pain in the trap muscle, leading to chronic tension and tightness.
| Characteristics | Values |
|---|---|
| Definition | A trapped muscle, or nerve entrapment, is when a peripheral nerve gets stuck between other body structures. |
| Causes | Repetitive overuse, strength imbalance, or constant low-level overload. |
| Symptoms | Chronic tension, tightness, pain, burning, tingling, and numbness. |
| Treatment | Nonsteroidal anti-inflammatory drugs (NSAIDs), muscle relaxants, pain relievers, kinesiology tape, massage, and surgery. |
| Prevention | Exercise, stretching, and staying flexible. |
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What You'll Learn
Trapezius muscle anatomy
The trapezius muscle is a large, triangular, paired muscle located in the upper back, starting at the back of the neck and head and extending across the shoulders and down the middle of the back, forming a diamond or trapezoid shape. It is one of the broadest and most superficial (closest to the skin) muscles of the upper back and trunk. The muscle has three sections—upper, middle, and lower—and several origin points along the midline of the posterior neck and back. The upper trapezius arises from the occipital bone in the back of the skull and the nuchal line in the back of the neck. The middle trapezius helps bring the shoulder blades back toward the spine, while the lower trapezius extends from the shoulder blades down the back, keeping the spine stable when twisting or bending over.
The trapezius muscle is a postural muscle, helping to maintain and adjust posture and spinal column stability. It also assists in active movements such as side bending, rotation of the head, elevating and depressing the shoulders, and internally rotating the arm. It is involved in the movement of the head and neck, including extending, tilting, and rotating the neck. The upper trapezius, for example, can elevate or bring up the shoulder girdle. The trapezius muscle works in conjunction with several other muscles, including the rhomboids, levator scapulae, serratus anterior, deltoid, and latissimus dorsi.
The trapezius muscle is susceptible to strain, though this is less common than in other muscles. Strains can be caused by acute trauma, such as a fall or collision, or through overuse over a long period. Tearing or straining the trapezius is more common in bodybuilders or those involved in high-velocity accidents. Symptoms of a trapezius strain include pain, stiffness, swelling, bruising, and tenderness in the neck, shoulders, and upper back.
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Trapezius muscle function
The trapezius muscle is a large muscle in the upper back, with two big muscles on either side. It starts at the back of the head and neck, extending across the shoulders and down the middle of the back, forming a trapezoid. The muscle is divided into three sections: descending (superior), ascending (inferior), and middle. The upper trapezius, the part that goes across the tops of the shoulders, can elevate or bring up the shoulder girdle. The middle trapezius helps bring the shoulder blades back towards the spine. The lower trapezius, also known as the inferior portion, keeps the spine stable when you twist or bend over. It also allows you to lower your shoulders.
The trapezius muscle acts as both a posture stabilizer and a movement muscle. It helps extend, tilt, and rotate the neck, bringing the head back, to the side, and turning it. It also helps maintain and adjust posture, including standing up straight or bending the upper back forward. The trapezius muscle is crucial during movements that involve pushing, reaching forward, or pulling down, as it helps maintain scapular stability, allowing the shoulder to move efficiently during various activities. It is involved in the movement of the head and neck, including turning the head to either side.
The trapezius muscle is used almost constantly throughout the day. It is involved in many motions, such as twisting the torso, shrugging the shoulders, pulling them back, and moving the shoulder when lifting the arm or throwing something. The trapezius pushes on the shoulder blade (scapula) to help make this happen.
The trapezius muscle is also an accessory breathing muscle, helping open up a small amount of breathing room in the upper chest area.
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Trapezius muscle pain causes
The trapezius muscle is a large muscle in the upper back, extending from the back of the head and neck, across the shoulders, and down the middle of the back. People commonly refer to the trapezius muscles as "traps" or "trap muscles". They are involved in several important functions, including:
- Maintaining and adjusting posture
- Supporting and facilitating head movement
- Supporting and facilitating neck movement
- Supporting and facilitating upper back movement
- Moving the shoulders
- Lifting the arms
Trapezius muscle pain can be caused by several factors, including:
Overuse and Injuries
Overuse and injuries are the most common causes of trapezius muscle pain. Acute injuries can occur suddenly due to trauma, such as a hard fall, collision, weightlifting, or contact sports. Chronic injuries, on the other hand, develop over time due to repetitive, low-impact activities, such as carrying a heavy bag for hours.
Nerve Damage
Nerve damage can also cause trapezius muscle pain. If the nerves connected to the trapezius muscles are damaged or injured, they can send pain signals that radiate into the traps, neck, shoulders, and head.
Stress
Stress can lead to unconscious muscle tension, especially in the shoulders, upper back, and neck. These areas are susceptible to the effects of stress, and the tension can result in pain.
Poor Posture
Slouching or slumping when sitting or standing can contribute to trapezius muscle pain. Poor posture pulls the trapezius muscles out of their usual alignment and creates extra tension, leading to tightness and pain.
Repetitive Work and Constrained Postures
Monotonous jobs with highly repetitive work, forceful exertions, static contractions, prolonged static loads, or constrained work postures can contribute to neck and shoulder disorders, including trapezius myalgia (TM).
Biomechanical and Psychosocial Factors
Trapezius myalgia is associated with both biomechanical and psychosocial factors. Radiography, MRI, electromyography, nerve conduction studies, or blood tests can be performed to rule out other conditions and help determine the underlying causes.
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Trapezius muscle pain relief
The trapezius muscle is a large muscle in the upper back. It starts at the back of the head and neck, extends across the shoulders, and down the middle of the back, forming a trapezoid. People commonly refer to the trapezius muscles as 'traps' or 'trap muscles'.
The trapezius muscles help maintain posture and move the upper back, neck and head. They are used almost constantly throughout the day.
Trapezius muscle pain can be caused by overuse, injuries, or nerve damage. Strains are one of the most common muscle injuries. They are usually sports injuries or repetitive strain injuries.
If you are experiencing trapezius muscle pain, there are several treatments you can try:
- Stretching: Certain stretches can help ease pain and keep movement flexible. Move in and out of a stretch gently, avoiding jerky movements and bouncing. Hold each stretch for about 15-30 seconds. A stretch should cause tension but no pain.
- Kinesiology tape: Kinesiology tape is an elastic tape that is wrapped around the painful area and may reduce pressure on the muscle. It is not specifically designed to treat muscle strains, but many athletes believe that it relieves pain, reduces swelling, and encourages blood flow after an injury.
- Dry needling: This technique involves inserting short, fine needles into the skin at specific trigger points. It is said to release muscle knots and may decrease pain.
- Resting, applying ice, and using over-the-counter pain medication: These home remedies may help to relieve trapezius muscle pain.
- Massage: Massage can help loosen up a tight muscle, and there is some evidence that it may reduce inflammation.
If you are experiencing pain in your back, neck, or the back of your head that lasts for more than a week, please visit a healthcare provider.
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Trapezius muscle strain grades
A trapped muscle refers to a condition where a muscle becomes compressed or pinched, often due to inflammation or injury. This can result in pain, stiffness, and limited mobility in the affected area. One muscle that is commonly affected by strains and injuries is the trapezius muscle, which is a large, flat muscle located in the upper back and neck. It plays a crucial role in shoulder movement and neck posture. When the trapezius muscle becomes strained or injured, it can lead to varying degrees of severity, known as grades.
Grade 1 Strain: A mild strain involves minimal damage to the muscle fibers and only a small number of fibers are affected. Symptoms include mild pain and tenderness in the trapezius muscle region, which can be felt during movement or when pressing on the muscle. There is no significant loss of strength or range of motion. Rest, ice, compression, and elevation (RICE protocol) are typically recommended for the first 24–48 hours, followed by gentle stretching and gradual resumption of activities.
Grade 2 Strain: A moderate strain involves more extensive damage to the muscle fibers, with a partial tear. The pain is more intense and may radiate to the neck, shoulder, or arm. Swelling and bruising may also be present. There is noticeable loss of strength and range of motion. Treatment includes a longer period of rest (typically 2–3 weeks) with a gradual return to activity. Physical therapy and targeted exercises are often prescribed to restore full function and prevent further injury.
Grade 3 Strain: A severe strain involves a complete rupture or tear of the muscle fibers. The pain is significant and immediate, and there may be a popping or snapping sensation at the time of injury. Severe swelling and bruising are common. The individual may experience weakness and an inability to move the shoulder or neck normally. Treatment typically involves immobilization with a sling or brace for several weeks, followed by extensive rehabilitation to restore strength and mobility. Surgical repair may be necessary in some cases.
It is important to note that these grades provide a general framework for understanding the severity of a trapezius muscle strain. Each individual's experience may vary, and a thorough assessment by a healthcare professional is necessary to determine the appropriate treatment plan. Early intervention is crucial to promote proper healing and prevent chronic issues.
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Frequently asked questions
A trapped muscle is another term for a trapezius muscle strain. The trapezius is a large muscle in your upper back that starts at the back of your head and neck, extends across your shoulders, and down the middle of your back.
Symptoms of a trapped muscle include mild to severe pain in the upper back, shoulders, or neck, swelling, bruising, tenderness, and limited mobility.
A trapped muscle is usually caused by overuse, injury, or nerve damage. Trapezius strains can also be caused by acute trauma, such as a hard fall or collision, or through chronic overuse, such as repetitive, low-impact activities over a long period of time.
Treatment for a trapped muscle can include medications such as nonsteroidal anti-inflammatory drugs (NSAIDs), muscle relaxants, or pain relievers. Other treatments may include kinesiology tape, massage, or surgery for more severe cases.
