What Is SCM-Related Pain?

Pain and discomfort in the neck can come from many different structures, including muscles, joints, nerves, and surrounding connective tissues. One muscle that is frequently involved in neck pain and related symptoms is the sternocleidomastoid, commonly called the SCM.

The SCM is a large, rope-like muscle located on each side of the neck. It runs from behind the ear down to the breastbone and collarbone. This muscle plays an important role in turning and tilting the head, helping stabilize the neck, and assisting with certain movements of the head and upper body.

Where Is SCM Pain Felt?

When the SCM becomes irritated, tight, overworked, or sensitive, discomfort may be felt directly along the side of the neck. However, SCM-related pain may also be referred, meaning symptoms are felt in areas away from the muscle itself.

Some people may experience discomfort in the:

• Side or front of the neck

• Jaw or face

• Area around the ear

• Head or temples

• Back of the head

• Upper chest or collarbone area

Because these symptoms can overlap with other conditions, it is important not to assume that all neck, jaw, ear, or headache symptoms are caused by the SCM.

What Can Contribute to SCM Irritation?

The SCM can become overloaded by repetitive or prolonged positions and movements. Potential contributing factors may include:

• Poor or prolonged head and neck posture

• Frequently looking down at a phone or other device

• Long periods of computer work

• Repetitive head turning

• Sleeping in an awkward position

• Stress-related muscle tension

• Neck injuries or strain

• Compensation for other problems involving the neck, shoulders, or jaw

In some cases, the SCM may be only one part of a larger pattern involving the cervical spine, jaw, shoulders, or other muscles.

Why Proper Evaluation Matters

SCM-related symptoms can sometimes resemble other conditions. Headaches, dizziness, facial discomfort, jaw pain, ear symptoms, and neck pain can have many possible causes. A thorough evaluation can help determine whether the SCM is contributing to the symptoms and identify other structures that may also be involved.

Treatment may focus on improving movement, addressing contributing posture or activity habits, reducing muscle sensitivity, and improving coordination and strength of the neck and surrounding areas.

If neck pain is severe, follows a significant injury, or is accompanied by unusual neurological symptoms, difficulty speaking or swallowing, weakness, or other concerning changes, prompt medical evaluation is important.

SCM-related pain is not always just “a tight muscle.” Understanding why the muscle is irritated—and how it may be interacting with the rest of the neck and jaw—can be an important part of finding the right approach to care.