To stretch the sternocleidomastoid (SCM), you combine two movements: tilting your ear toward your shoulder, then lifting your chin upward. This targets the thick muscle running from your collarbone and breastbone up to the bony bump behind your ear. Hold each stretch for at least 10 seconds, and you should feel a pull along the front and side of your neck.
Why the SCM Gets Tight
The SCM runs from the top edge of your breastbone and the inner quarter of your collarbone up to the mastoid process, the bony ridge just behind your ear. When one side contracts, it turns your head to the opposite side, tilts your ear toward the contracting side, and tips your head slightly back. It also helps lift your chest during deep breathing.
Forward head posture is one of the most common reasons the SCM shortens. When your head drifts forward of your body’s center of gravity, the SCM stays in a chronically shortened position. Research published in the Journal of Physical Therapy Science found that this shortening reduces the muscle’s ability to generate force, weakening it even as it feels tight. Hours of looking down at a phone, hunching over a laptop, or sleeping with your head propped too high all contribute.
What a Tight SCM Feels Like
A tight SCM rarely hurts where you’d expect. Instead, it sends pain elsewhere. Trigger points in the sternal head (the portion attached to your breastbone) can cause pain behind the eye, across the cheek and eyebrow, into the throat, and at the base of the skull. Trigger points in the clavicular head (the portion attached to your collarbone) tend to refer pain to the forehead, ear, and the area behind the ear.
The clavicular division also plays a role in your sense of balance. When it’s tight or full of trigger points, you can experience dizziness, nausea, and a vague feeling of unsteadiness. One case study in the Journal of the Canadian Chiropractic Association documented a patient with SCM dysfunction who had poor proprioceptive balance, meaning her brain was getting unreliable position signals from the tight muscles in her neck. If you’ve noticed dizziness alongside neck stiffness, the SCM is worth investigating.
The Basic SCM Stretch
This stretch has two phases. The first targets the upper trapezius and general side-of-neck muscles. The second phase isolates the SCM specifically.
- Set your posture first. Stand with feet hip-width apart. Pull your shoulders down and back without arching your lower back. Brace your core lightly so your torso stays stable throughout.
- Tilt your ear toward your shoulder. Slowly draw your right ear toward your right shoulder. Stop when you feel a clear stretch on the left side of your neck. Keep both shoulders pulled down, not hiking up to meet your ear.
- Add the chin lift. From that tilted position, slowly lift your chin upward toward the ceiling. This is what shifts the stretch from the general side of your neck into the SCM specifically. You should feel the pull move toward the front of your neck, along that thick cord of muscle.
- Hold for 10 to 15 seconds. Breathe normally. Return slowly to the starting position, then repeat on the other side.
Aim for 2 to 4 repetitions on each side. Move slowly and with control. Jerky or fast movements through the neck are never productive and risk strain.
Rotation Stretch for Deeper Access
Because the SCM rotates your head to the opposite side, you can also stretch it through rotation. Turn your head to the right as far as is comfortable, then tilt your chin slightly upward. You’ll feel the stretch along the left SCM. Hold for 10 to 15 seconds and repeat on both sides. This variation hits the muscle from a different angle than the lateral tilt and can feel more effective if your tightness is primarily in the sternal head.
For a combined approach, try both variations in sequence: lateral tilt with chin lift first, then the rotation stretch. Two to four reps of each, on both sides, takes about five minutes and covers the full length of the muscle.
Self-Massage for Trigger Points
Stretching alone sometimes isn’t enough to release trigger points. You can locate the SCM by turning your head to one side and pinching the thick cord of muscle that pops out on the opposite side, between your thumb and fingers. It sits right in front of the larger neck muscles and is surprisingly easy to grab.
Once you’ve found a tender spot, apply gentle sustained pressure with your fingertips for about 10 seconds. Release, then move to the next tender area. Work your way from just below the ear down toward the collarbone. The sternal head sits closer to the center of your throat, while the clavicular head angles slightly outward. Both can harbor trigger points, so explore the full length of the muscle.
Be gentle. The carotid artery and carotid sinus sit nearby, and pressing on the carotid sinus can cause dizziness or even fainting in sensitive individuals. If you feel your pulse under your fingers, you’re too close to the artery. Move your fingers slightly forward or backward to stay on muscle tissue. People who are prone to blood pressure drops or who have a history of fainting with neck pressure should skip self-massage and work with a physical therapist instead.
Chin Tucks to Address the Root Cause
Stretching relieves symptoms, but if forward head posture is driving the tightness, you need to correct the posture itself. Chin tucks are the simplest corrective exercise. Sit or stand tall, then gently draw your chin straight back as if making a double chin. Hold for 5 to 10 seconds, release, and repeat 10 times. This retrains the deep neck flexors that weaken when the head drifts forward, taking chronic load off the SCM.
Pairing chin tucks with SCM stretches addresses both the symptom (tightness) and the cause (posture). Do the stretches to restore length, then do chin tucks to keep the muscle from shortening again throughout the day. A good habit is to do a quick round of both whenever you’ve been sitting for more than an hour.
How Often to Stretch
For general maintenance, stretching the SCM once or twice a day is enough. If you’re dealing with active trigger points, headaches, or noticeable asymmetry in your neck rotation, two to three short sessions spread throughout the day will produce faster results. Each session only needs 2 to 4 reps per side with 10-second holds, so you’re looking at a few minutes total.
Consistency matters more than intensity. A tight SCM that has been short for months or years won’t release in a single aggressive session. Gentle, repeated stretching over weeks gradually restores length. If your range of motion isn’t improving after two to three weeks of daily stretching, or if you’re experiencing dizziness, persistent headaches, or pain that radiates into your face, a hands-on evaluation from a physical therapist can identify whether other structures are involved.