One-Sided Neck Pain — Causes and What to Do About It

Your neck hurts — but only on one side. You can barely turn your head, every movement in one direction is painful, and you are wondering: why only on the left? Or why only on the right? One-sided neck pain is extremely common and in most cases has harmless, but very treatable causes (Gross et al. 2015).

In this article, you will learn why neck pain often affects only one side, which structures are involved, how to figure out what is going on yourself — and which 5 targeted exercises can help. Plus: the red flags that mean you should see a doctor.

Why Does Only One Side Hurt?

The cervical spine is a symmetrically built system of vertebrae, discs, facet joints, muscles, and nerves. Yet neck pain is almost never symmetrical — and there are good reasons for that.

Our daily life is not symmetrical. You have a dominant hand, always carry bags on the same shoulder, hold your phone to the same ear, and prefer sleeping on one side. These asymmetries add up over the years and cause muscles, joints, and nerves on one side to bear more load than on the other.

Bogduk (2011) showed that the facet joints of the cervical spine are among the most common sources of pain in one-sided neck pain. The segments C2/C3 and C5/C6 are particularly affected, as they bear the highest mechanical load.

Good to know: One-sided neck pain is muscular or joint-related in 80–90% of cases — and therefore highly treatable with targeted exercises and behavioral changes.

The 6 Most Common Causes of One-Sided Neck Pain

1. Myofascial Trigger Points

Trigger points are tight, pressure-sensitive spots in the muscle that can refer pain to other regions (referred pain). In one-sided neck pain, these muscles are particularly involved:

• Upper trapezius: The most common trigger point of all. Causes pain from the neck over the shoulder to the temple — almost always on one side.
• Levator scapulae: Connects the upper cervical vertebrae (C1–C4) to the shoulder blade. Trigger points here cause a stabbing pain on the side of the neck that worsens with head rotation.
• Sternocleidomastoid (SCM): The large lateral neck muscle. Trigger points can cause pain at the forehead, around the eye, and at the ear.
• Scalenes: Lateral neck muscles that shorten with poor posture and can radiate pain deep into the neck and down the arm.

Fernández-de-las-Peñas et al. (2006) found that over 90% of patients with one-sided neck pain had at least one active trigger point in the neck-shoulder area.

2. Asymmetric Posture and Loading

Asymmetric posture is one of the main reasons for one-sided neck problems. Typical triggers:

• Monitor positioned to one side instead of centered on your desk
• Phone cradled between ear and shoulder
• Always the same hand on the steering wheel
• Backpack or bag always on the same shoulder
• Head permanently turned to one side during sleep (stomach sleeping)

All these habits load the muscles and joints on one side more heavily. Over weeks and months, muscular imbalances develop: one side becomes shortened and tight, the other overstretched and weak.

3. One-Sided Strain from Sports

Sports with asymmetric movement patterns can trigger or worsen neck pain on one side:

• Tennis, badminton, squash: The racket arm side is loaded much more
• Golf: The rotation always stresses the same side of the neck
• Climbing: One-sided overhead reaching
• Weight training: Uneven execution of overhead presses or rows

4. Acute Torticollis (Wry Neck)

Torticollis is a sudden, painful tilting of the head. You wake up in the morning and cannot turn your head — it feels locked in place. The muscles on one side (usually SCM and trapezius) are so cramped that any movement in the opposite direction causes severe pain.

An acute torticollis resolves on its own within 3–7 days in most cases. Heat, gentle movement, and possibly a mild painkiller help. Avoid protective postures — they delay healing.

Tip: For an acute wry neck, try placing a warm towel around your neck and slowly moving your head in all directions, pain-free. Do not force it — only go up to the pain threshold.

5. Facet Joint Irritation

The facet joints are the small spinal joints that connect the vertebrae to each other. They enable rotation and lateral bending of the head. When a facet joint on one side is irritated, inflamed, or degenerated, it typically causes one-sided neck pain.

Characteristics of facet joint pain:

• Pain worsens with backward bending and rotation toward the affected side
• Localized tenderness next to the spine
• Morning stiffness that improves with movement
• Pain can radiate into the shoulder or back of the head

Manchuikina et al. (2022) showed that facet joint syndromes can be responsible for up to 55% of chronic neck pain — and they almost always occur on one side.

6. Nerve Irritation (Cervical Radiculopathy)

When a nerve in the cervical spine is compressed — by a herniated disc, bony narrowing (stenosis), or swelling — a cervical radiculopathy develops. The pain is almost always one-sided and typically radiates into the arm.

Typical signs:

• One-sided neck pain with radiation into the arm (shoulder, upper arm, forearm, hand)
• Tingling or numbness in specific fingers
• Weakness when gripping or lifting the arm
• Pain worsens with coughing, sneezing, or tilting the head toward the affected side

A radiculopathy should be evaluated by a doctor, as specific treatment may be necessary in some cases.

Self-Test: What Is Causing Your Pain?

With these three simple tests, you can narrow down which structure is affected. They do not replace a medical diagnosis but provide good orientation.

Test 1: Which Side Is Affected?

Stand in front of a mirror and observe:

• Is one shoulder higher than the other?
• Is your head slightly tilted to one side?
• Is one trapezius (the muscle between neck and shoulder) thicker or more tense?

Note the side. In most cases, the higher, more tense side is the painful one.

Test 2: Check Rotation

• Turn your head slowly to the left, then to the right
• Try to touch your shoulder with your chin
• Compare: which side is restricted? Where does pain occur?

Facet joint sign: Pain with rotation and backward bending toward the affected side. Muscular sign: Pain with rotation away from the affected side (the shortened muscle is being stretched).

Test 3: Palpate Pressure Points

• Feel along the muscles on the painful side with your index and middle fingers
• Start at the base of the skull and work your way down to the shoulder
• Look for hard, pressure-sensitive spots (trigger points)
• Does the pressure pain radiate to other areas? (Referred pain)

Tip: Typical trigger point locations are: directly under the base of the skull (suboccipital), on the side of the neck at the C4–C5 level, and at the junction between neck and shoulder (upper trapezius).

5 Targeted Exercises for the Affected Side

The following exercises are specifically designed for one-sided neck pain. Perform them first on the painful side, then on the healthy side — this helps balance out the asymmetry. All exercises can also be tracked with the Cervio app.

Exercise 1: One-Sided Suboccipital Release

Releases the deep neck muscles specifically on the affected side.

• Lie on your back and place a tennis ball under the base of your skull — on the painful side, just beside the spine
• Let the weight of your head rest on the ball
• Make slow, small nodding movements (“yes”) — 10–15 repetitions
• Then turn your head slightly to the opposite side so the ball presses more precisely into the muscle belly
• 2–3 minutes, deep belly breathing

Exercise 2: Levator Scapulae Stretch

The levator scapulae is almost always shortened in one-sided neck pain. This stretch targets it directly.

• Sit upright; the hand on the affected side grips under the chair (to anchor the shoulder)
• Tilt your head forward and down — chin toward the opposite chest
• Place the other hand on the back of your head and gently guide into the stretch
• You will feel a stretch between the neck and shoulder blade on the affected side
• Hold 30 seconds, 3 repetitions
• Then stretch the healthy side (shorter: 20 seconds)

Exercise 3: Lateral Neck Flexion with Isometric Resistance

Strengthens the lateral neck muscles and corrects imbalances.

• Sit upright, place your hand against the temple on the painful side
• Press your head against your hand — your hand resists (isometric, no movement)
• Hold 5 seconds, start with gentle pressure (30% of maximum force)
• 10 reps on the affected side, then 10 on the other side
• 3 rounds with 30 seconds rest

Important: Isometric exercises (muscle tension without movement) are safer for acute neck pain than dynamic exercises because they do not move the joints while still improving stabilization.

Exercise 4: One-Sided SCM Stretch

Stretches the sternocleidomastoid on the shortened side and can relieve pain in the neck, forehead, and eye area.

• Sit upright, place the hand on the affected side on the collarbone of the same side (to anchor the muscle attachment)
• Tilt your head slightly backward
• Then rotate your head toward the opposite side
• You will feel a stretch on the front of the neck
• Hold 20–30 seconds, no bouncing
• 3 repetitions, then the other side

Exercise 5: Chin Tucks with Lateral Tilt

Activates the deep neck flexors and simultaneously corrects the lateral imbalance.

• Sit or stand upright, eyes looking straight ahead
• Perform a chin tuck: gently draw your chin straight back (double chin)
• In the chin tuck position, tilt your head slightly toward the healthy side (5–10 degrees)
• Hold 5 seconds, then return to center
• 10 reps, 3 rounds
• The lateral tilt toward the healthy side stretches the shortened muscles on the painful side, while the chin tuck activates the deep stabilizers

When to See a Doctor: Red Flags for One-Sided Neck Pain

In most cases, one-sided neck pain is harmless and improves with the right exercises within days to weeks. However, there are warning signs where you should seek medical attention:

• Radiating pain into the arm with numbness or weakness: May indicate a herniated disc or nerve compression
• Neck pain after an accident or fall: Fractures or ligament injuries must be ruled out
• Fever and neck stiffness: May indicate meningitis or infection — emergency!
• Unexplained weight loss and night pain: May point to a serious underlying condition
• Increasing weakness in arms or legs: Possible spinal cord compression — see a doctor immediately
• Difficulty swallowing or hoarseness: May indicate pathology in the front of the neck
• No improvement after 6 weeks: If symptoms persist despite consistent exercises, further diagnostic workup is warranted

Rule of thumb: If the pain is getting worse instead of better, if neurological symptoms (tingling, numbness, weakness) develop, or if you feel generally unwell — it is better to see a doctor one time too many than one time too few.

Prevention: How to Avoid One-Sided Neck Pain

Since one-sided neck pain is almost always caused by one-sided loading, the most important measure is: bring symmetry into your daily life.

At the Workplace

• Center your monitor: Directly in front of you, top edge at eye level
• Headset instead of phone receiver: Prevents cradling between ear and shoulder
• Switch your mouse hand: Sounds unusual, but it helps balance the asymmetry
• Break every 30–45 minutes: Stand up, mobilize your neck, switch positions

While Sleeping

• Side sleeping with a proper pillow: The pillow must fill the space between shoulder and ear so the cervical spine stays straight
• Avoid stomach sleeping: It forces permanent head rotation and is the most common cause of morning one-sided neck pain
• Practice switching sides: Consciously try to sleep on both sides

In Daily Life

• Switch bag and shoulder: Carry them regularly on the other shoulder or use a backpack with both straps
• Smartphone at eye level: Instead of dropping your head, hold the phone up — especially during extended use
• Train regularly: Targeted neck exercises 3–5 times per week strengthen the muscles symmetrically and prevent one-sided problems

During Sports

• Compensatory training: For one-sided sports (tennis, golf), specifically strengthen the opposite side
• Warm up: Mobilize the neck before sports — slow rotation, lateral bending, chin tucks
• Check your technique: Poor technique during weight training is a common trigger

Track and Understand One-Sided Neck Pain

A pain diary can help you identify patterns: On which days is the pain worse? After which activities? On which side? With the Cervio app, you can log your symptoms after every training session and track the trend over weeks — so you can see in black and white whether your exercises are working.