The sternocleidomastoid (SCM) muscle is one of the major muscles in your neck. Injuries to this muscle can cause significant pain, limited movement, and discomfort during daily activities. By understanding the anatomy, potential causes, signs, and treatment options, you can make informed decisions about your care.
Anatomy of the Sternocleidomastoid Muscle
Knowing the anatomy of the SCM muscle is key to understanding how injuries occur and how they affect your body.
Structure & Location
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Structure: The SCM is a long, paired muscle that runs on each side of your neck.
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Location: It is easily visible when you turn your head to the side. It forms a diagonal band from the chest and collarbone, ascending up to the skull behind the ear.
Origin & Insertion
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Origin:
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Sternal head: Begins at the top of the manubrium of the sternum (the upper part of your chest bone).
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Clavicular head: Starts at the medial (inner) portion of the clavicle (collarbone).
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Insertion: Both heads come together and attach at the mastoid process, a bony prominence located just behind your ear on the temporal bone.
Blood Supply
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Main Arteries:
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The occipital artery (provides blood from the back of the head), and
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Branches from the superior thyroid artery (supplying the front portion of the neck).
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Nerve Supply
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Primary Nerve: The spinal accessory nerve (cranial nerve XI) is the main nerve that controls the SCM.
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Additional Innervation: Some branches from the cervical plexus also contribute to its nerve supply.
Key Functions
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Head Rotation: The SCM helps turn your head to the opposite side; for example, the right SCM rotates the head to the left.
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Neck Flexion: When both SCM muscles (right and left) work together, they help flex the neck, allowing you to bring your chin toward your chest.
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Lateral Flexion: It assists in bending the neck sideways.
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Neck Extension (Assisting): Plays a role when combined with other muscles to extend the neck.
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Elevation of the Chest: When both SCM muscles contract, they can help lift the chest during deep or forced breathing (acting as accessory breathing muscles).
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Postural Support: They help maintain head and neck posture and balance during daily movements.
Types of Sternocleidomastoid Muscle Injury
SCM injuries vary in severity and presentation. The most common types include:
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Strains: Overstretching of the muscle fibers.
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Sprains: Injury to the supportive tendons and ligaments around the muscle.
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Partial Tears: Incomplete disruptions in the muscle fibers.
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Complete Tears: Rare but severe, where the muscle is completely torn.
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Contusions (Bruises): Direct blows or impact causing bleeding within the muscle tissue.
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Chronic Inflammation/Tendinopathy: Long-term overuse leading to persistent pain and inflammation.
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Myositis Ossificans: A rare condition where muscle tissue begins to form bone.
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Repetitive Strain Injuries: Result from repeated minor injuries due to overuse.
Causes of SCM Injury
Understanding what can trigger an SCM injury helps in prevention and early management. Here are 20 common causes:
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Sports Injuries: Sudden movements or impacts during athletic activities.
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Car Accidents: Whiplash or direct impact during a collision.
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Whiplash Injuries: Rapid forward and backward movement of the neck.
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Falls: Landing awkwardly and straining the neck muscles.
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Direct Blows: Trauma from a hit or impact directly to the neck.
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Repetitive Strain: Overuse from repetitive motions, especially in sports or certain jobs.
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Overstretching: Sudden, forceful movements that exceed the muscle’s range.
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Sudden Forceful Movements: Quick, unexpected motions during exercise.
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Occupational Hazards: Jobs that require heavy lifting or awkward postures.
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Improper Exercise Technique: Incorrect movements during workouts or sports.
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Tension from Stress: Muscle tightness and strain related to stress.
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Overuse in Athletics: Continuous training without adequate rest.
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Poor Posture: Extended periods of slouched posture while working or using digital devices.
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Contact Sports: Injuries from collisions in sports like rugby, football, or hockey.
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Hyperextension: Bending the neck too far backwards.
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Underlying Muscle Imbalances: Uneven strength or flexibility across neck muscles.
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Long Hours at a Computer: Poor ergonomic setups leading to sustained strain.
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Repetitive Computer Work: Constant tilting or turning of the head.
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Weightlifting Accidents: Improper lifting techniques stressing the neck.
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Accidental Trauma: Everyday accidents that impact the neck area.
Recognizing the Symptoms
SCM injuries can present with a range of signs and symptoms. Knowing these can help you recognize when something isn’t right:
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Neck Pain: A persistent or sharp pain in the neck area.
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Muscle Tightness: A feeling of tightness or stiffness.
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Limited Range of Motion: Difficulty in moving the head normally.
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Swelling: Noticeable puffiness or inflammation in the neck.
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Bruising or Discoloration: Dark spots or redness due to internal bleeding.
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Headaches: Pain that originates from neck tension.
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Stiff Neck: A general feeling of rigidity in the neck.
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Muscle Spasms: Involuntary contractions or “knotting” in the muscle.
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Pain with Rotation: Increased pain when turning your head.
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Tenderness: Soreness when the neck is touched.
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Difficulty Turning the Head: Inability to easily rotate the head from side to side.
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Neck Fatigue: Feeling that the neck muscles become tired quickly.
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Sharp or Burning Sensation: Sudden, intense discomfort in the muscle.
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Pain When Lying Down: Discomfort that may interfere with sleep.
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Difficulty Breathing: In severe cases, pain may affect the muscles used for breathing.
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Radiating Pain: Discomfort that may spread toward the shoulder.
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Trigger Points: Small areas of pain or “knots” in the muscle.
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Sensitivity to Pressure: Increased pain when pressing on certain spots.
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Numbness or Tingling: Occasional nerve involvement causing these sensations.
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Postural Imbalance: A noticeable shift in head or neck position, leading to poor posture.
Diagnostic Tests for SCM Injury
Healthcare providers use several methods to accurately diagnose an SCM injury. Here are 20 common diagnostic approaches:
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Physical Examination: The doctor will assess your neck for pain, swelling, and range of motion.
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Palpation: Feeling the muscle manually to identify tender or painful areas.
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Range of Motion Assessment: Testing how far you can turn or tilt your head.
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Manual Muscle Testing: Checking the strength of the neck muscles.
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Ultrasound Imaging: A non-invasive way to view the muscle fibers and detect tears.
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X-Ray: To rule out any accompanying bone fractures or dislocations.
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MRI Scan: Provides a detailed image of soft tissues, including the muscle.
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CT Scan: Sometimes used when more detail is needed.
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Electromyography (EMG): Measures the electrical activity of muscles and helps assess nerve function.
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Nerve Conduction Studies: Evaluate how well the nerves around the SCM are working.
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Blood Tests: To check for elevated markers that indicate inflammation.
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Functional Movement Assessment: Observing how your neck moves during certain activities.
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Posture Analysis: Assessing your posture to see if muscle imbalance contributed.
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Dynamic Ultrasound: Real-time imaging while the patient moves.
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Bone Scan: Rarely used but can help assess underlying bone issues.
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Doppler Ultrasound: Checks blood flow if vascular injury is suspected.
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Myofascial Trigger Point Examination: Identifying specific painful “knots.”
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Neurological Exam: To ensure no nerve injury has occurred.
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Physical Therapy Evaluation: Therapists often perform detailed movement assessments.
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Stress Tests: Observations under controlled conditions to see how the muscle responds.
Non-Pharmacological Treatments
Many treatments focus on helping your body heal naturally without relying solely on drugs. Here are 30 evidence-based, non-drug therapies to treat SCM injury:
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Rest: Allow the injured muscle time to heal by avoiding strenuous neck movements.
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Ice Application: Apply an ice pack during the first 48 hours to reduce swelling.
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Heat Application: Use heat after the initial phase to relax the muscle and improve circulation.
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Physical Therapy: Guided exercises and manual therapy provided by a professional.
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Gentle Stretching: Slow, controlled stretches to restore range of motion.
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Strengthening Exercises: Gradual exercises to rebuild muscle strength.
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Massage Therapy: Helps reduce tension, improve blood flow, and relieve trigger points.
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Manual Therapy: Hands-on techniques from a skilled therapist to mobilize the muscle.
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Chiropractic Adjustments: Manual adjustments may relieve neck pain and improve alignment.
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Acupuncture: Thin needles may help release tension and relieve pain.
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Ergonomic Adjustments: Improving your workstation setup to reduce neck strain.
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Posture Correction: Exercises and education to improve sitting and standing posture.
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Soft Tissue Mobilization: Techniques to gently loosen tight muscles.
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Myofascial Release: A type of manual therapy focused on releasing fascial restrictions.
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Trigger Point Therapy: Targeting small, tight spots in the muscle that cause pain.
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Ultrasound Therapy: Using sound waves to promote healing in muscle tissues.
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Electrical Stimulation: Reducing pain and promoting muscle relaxation with controlled electrical impulses.
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Kinesiology Taping: Special tape applied to support the muscle while allowing movement.
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Progressive Muscle Relaxation: Techniques that help reduce muscle tension throughout the body.
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Yoga: Gentle yoga can improve flexibility, strength, and relieve stress.
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Pilates: Focuses on building core and neck strength with controlled movements.
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Neck Bracing (When Recommended): Supporting the neck during activities as advised by a doctor.
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Breathing Exercises: Techniques to reduce tension and promote relaxation.
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Hydrotherapy: Warm water therapy can relax the muscles and ease pain.
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Contrast Therapy: Alternating between hot and cold treatments to improve circulation.
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Meditation: Helps reduce overall stress which can contribute to muscle tension.
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Guided Imagery: A relaxation technique that focuses on mental imagery to ease pain.
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Tai Chi: A gentle martial art that improves balance and muscle control.
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Biofeedback: Helps you learn to control muscle tension through feedback from sensors.
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Lifestyle Modifications: Adjusting daily habits such as proper sleep, healthy eating, and stress reduction can foster overall recovery.
Medications Often Prescribed
While many treatments are non-pharmacological, medications can help manage pain and inflammation. Always use these medications under a doctor’s supervision. Here are 20 drugs that might be used:
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Ibuprofen: A common nonsteroidal anti-inflammatory drug (NSAID) for reducing pain and swelling.
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Naproxen: Another NSAID that works similarly to ibuprofen.
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Diclofenac: An NSAID available in oral or topical forms to relieve inflammation.
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Acetaminophen: Helps reduce pain though it does not reduce inflammation.
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Aspirin: Often used for its anti-inflammatory and pain-relieving properties.
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Celecoxib: A COX-2 inhibitor that can help manage pain with potentially fewer stomach side effects.
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Indomethacin: A potent NSAID used in certain inflammatory conditions.
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Cyclobenzaprine: A muscle relaxant that can help relieve muscle spasms.
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Tizanidine: Another muscle relaxant that eases tightness in the neck muscles.
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Baclofen: Sometimes prescribed for muscle spasticity to provide relief.
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Tramadol: An opioid-like pain reliever, used for moderate to severe pain.
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Codeine: An opioid used in pain control, typically in combination with other medications.
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Oxycodone: A stronger opioid for managing severe pain (used cautiously).
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Gabapentin: Sometimes prescribed if nerve pain accompanies the muscle injury.
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Pregabalin: Also used for nerve-related pain management.
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Topical Diclofenac Gel: Allows direct application to the painful area with fewer systemic effects.
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Topical Capsaicin Cream: Helps reduce pain by desensitizing pain receptors in the skin.
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Corticosteroids (Oral Prednisone): Used to reduce severe inflammation if necessary.
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Lidocaine Patches: Provide localized pain relief when applied over the affected area.
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Meloxicam: An NSAID that is sometimes chosen for its ease of use and tolerability.
Surgical Treatment Options
Most sternocleidomastoid injuries are treated conservatively, but in severe or complicated cases, surgery may be considered. Although surgery is rare, here are 10 potential surgical options:
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Surgical Repair of a Muscle Tear: Directly suturing torn muscle fibers together.
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Debridement: Removing damaged or necrotic tissue to promote healing.
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Scar Tissue Release: Surgically breaking down adhesions that restrict movement.
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Myotomy: Cutting part of the muscle to relieve chronic spasm or tension (used in select cases).
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Tendon Repair: Repairing torn tendon attachments in or around the muscle.
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Microvascular Repair: Restoring blood flow by repairing small blood vessels if injured.
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Fascia Release Surgery: Addressing tight fascial layers that limit mobility.
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Endoscopic Muscle Release: Minimally invasive release of muscle adhesions.
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Nerve Repair: If the injury involves the spinal accessory nerve or other nerve branches.
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Associated Joint Corrections: Addressing any joint or bony abnormalities that contribute to muscle strain.
Prevention Strategies
Preventing SCM injuries is achievable through proper care and daily practices. Here are 10 prevention methods:
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Practice Good Posture: Maintain a neutral spine while sitting, standing, or working.
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Use Ergonomic Furniture: Choose chairs and desks that support natural neck alignment.
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Avoid Sudden Neck Movements: Move slowly and mindfully, especially when turning your head.
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Warm Up Before Exercise: Engage in gentle stretches to prepare the neck for activity.
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Regular Neck Stretches: Incorporate simple neck exercises into your daily routine.
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Proper Lifting Techniques: Use your legs, not your back or neck, when lifting heavy objects.
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Stay Active: Build overall strength with a balanced exercise routine.
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Take Frequent Breaks: Reduce long periods of sitting or screen time by taking short breaks.
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Use Supportive Pillows: Choose pillows that keep your neck aligned during sleep.
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Wear Neck Braces When Needed: Use additional support during high-risk activities after consulting your healthcare provider.
When to See a Doctor
It is important to know when to seek professional medical help for an SCM injury. See your doctor if you experience:
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Severe or worsening pain that does not improve with rest or over-the-counter treatments.
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Persistent swelling, redness, or bruising in the neck.
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Limited range of motion or significant difficulty turning your head.
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Numbness, tingling, or other signs suggesting nerve involvement.
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Pain that interferes with breathing or daily activities.
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A recent trauma to the neck with associated pain that does not improve.
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Any new symptoms that cause you concern or that affect your quality of life.
Frequently Asked Questions
Below are 15 commonly asked questions about sternocleidomastoid muscle injuries along with straightforward answers.
1. What is a sternocleidomastoid muscle injury?
A sternocleidomastoid injury is damage (such as a strain, tear, or contusion) to one or both of the major neck muscles responsible for turning and flexing your head.
2. How does an SCM injury usually happen?
It often occurs from sudden impacts, falls, sports injuries, poor posture, or repetitive strain from daily activities.
3. What are the common symptoms?
Common symptoms include neck pain, stiffness, limited range of motion, swelling, muscle spasms, headaches, and sometimes tender trigger points.
4. Can an SCM injury heal on its own?
Yes, many minor injuries improve with rest, ice, and physical therapy. However, severe injuries may require more targeted treatment.
5. What treatment options are available?
Treatments range from non-pharmacological methods (rest, ice, physical therapy, stretching, massage) to medications (NSAIDs, muscle relaxants) and, in rare cases, surgery.
6. How does physical therapy help?
Physical therapists guide you through stretching, strengthening, and manual therapies that improve healing, restore range of motion, and reduce pain.
7. Are surgeries always needed for SCM injuries?
No. Most SCM injuries respond well to conservative treatments. Surgery is reserved for severe cases such as complete tears or injuries that do not respond to other therapies.
8. What medications are usually prescribed?
Doctors often recommend NSAIDs, acetaminophen, and muscle relaxants to help manage pain and inflammation.
9. How long is the recovery time?
Recovery varies by injury severity—from a few days for mild strains to several weeks or even months for more severe injuries.
10. What can I do at home to relieve pain?
Simple measures like applying ice or heat, resting, and gently stretching the neck can help, along with proper posture adjustments.
11. How can I prevent future SCM injuries?
Maintain good posture, use ergonomically designed furniture, warm up properly before exercise, and take frequent breaks if you work long hours at a computer.
12. What diagnostic tests may be used?
Your doctor may use physical exams, ultrasound, X-rays, MRI scans, EMG tests, and nerve conduction studies to accurately diagnose the injury.
13. Should I use ice or heat for my injury?
Ice helps reduce swelling in the first 48 hours after an injury. After this period, heat can help relax the muscle and improve blood flow.
14. Can I continue exercising with an SCM injury?
Light exercises and stretches are often safe. However, avoid activities that worsen the pain. Always consult a professional before resuming exercise after an injury.
15. When is it essential to see a doctor for neck pain?
Seek professional medical advice if you experience severe pain, persistent limited neck movement, numbness, or any symptoms that impede your daily life.
Conclusion
Sternocleidomastoid muscle injuries, though sometimes painful and disruptive, can usually be managed with a combination of non-pharmacological treatments, medications, and lifestyle adjustments. Early diagnosis, proper care, and preventive measures are key to an effective recovery. If you are experiencing persistent or severe symptoms, do not hesitate to consult your healthcare provider for an individualized treatment plan.
Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.
The article is written by Team Rxharun and reviewed by the Rx Editorial Board Members
Last Update: April 13, 2025.
