Tingling, Numbness, or Shoulder Pain? It Could Be Thoracic Outlet Syndrome

By Dr. Alex Oglesby

If you've been dealing with numbness, tingling, aching, or weakness that travels from your neck into your shoulder, arm, or hand, you may have heard the term Thoracic Outlet Syndrome (TOS). While it is often mistaken for a pinched nerve in the neck or even carpal tunnel syndrome, Thoracic Outlet Syndrome is a unique condition that involves compression of important nerves and blood vessels as they travel from the neck into the arm.

The good news is that many cases respond well to conservative care, and chiropractic treatment can play an important role in reducing symptoms and improving function.

What Is Thoracic Outlet Syndrome?

Thoracic Outlet Syndrome occurs when the nerves, arteries, or veins that travel through a narrow passageway between your neck and shoulder become compressed or irritated. This area, known as the thoracic outlet, is bordered by the collarbone, first rib, and surrounding muscles.

Three main types of Thoracic Outlet Syndrome:

1. Neurogenic TOS: The most common form, accounting for approximately 90-95% of cases. It involves compression of the brachial plexus, the network of nerves that supplies the shoulder, arm, and hand. This can result in numbness/tingling to the hand, decreased grip strength and reduced nerve function in the arms.

2. Venous TOS: Compression of the veins can lead to swelling, heaviness, discoloration, and aching in the affected arm.

3. Arterial TOS: The rarest type, involving compression of an artery. Symptoms may include coldness, color changes, pain, or weakness due to reduced blood flow.

Most people seeking chiropractic care have the neurogenic form.

What Causes Thoracic Outlet Syndrome?

Thoracic Outlet Syndrome usually develops from a combination of factors rather than a single injury. Common causes include:

• Poor posture, especially forward head posture and rounded shoulders

• Repetitive overhead activities such as swimming, baseball, volleyball, or construction work

• Muscle tightness in the neck, chest, or shoulders

• Previous whiplash or neck injuries

• Repetitive lifting or carrying heavy loads

• Long hours spent working at a computer

As posture deteriorates, the muscles surrounding the thoracic outlet become tight and imbalanced, reducing the available space for the nerves and blood vessels.

Common Symptoms

Because the brachial plexus controls much of the arm and hand, symptoms can vary widely. Patients commonly report:

• Numbness or tingling in the arm or fingers

• Pain in the neck, shoulder, upper back, or arm

• Weakness or fatigue with overhead activities

• Hand clumsiness or decreased grip strength

• A feeling of heaviness in the arm

• Symptoms that worsen while driving, sleeping, or working overhead

How Is Thoracic Outlet Syndrome Diagnosed?

Diagnosing Thoracic Outlet Syndrome can sometimes be challenging because its symptoms overlap with other conditions, including cervical disc injuries, rotator cuff problems, ulnar nerve entrapment, and carpal tunnel syndrome.

A chiropractor will begin with a detailed history and physical examination. This typically includes:

• Evaluating posture and spinal alignment

• Assessing neck, shoulder, and rib mobility

• Testing muscle strength and sensation

• Performing orthopedic tests designed to reproduce symptoms

• Evaluating movement patterns and muscular imbalances

Depending on your presentation, additional imaging such as X-rays, MRI, ultrasound, or nerve conduction studies may be recommended to rule out other conditions or identify anatomical abnormalities.

How Can Chiropractic Care Help?

The goal of chiropractic care is not simply to treat the symptoms but to address the mechanical factors contributing to nerve compression.Treatment is always individualized but may include several components.

Chiropractic Adjustments

Restricted movement in the cervical spine, upper thoracic spine, or ribs can alter posture and muscle function. Gentle chiropractic adjustments help restore normal joint motion, reduce irritation, and improve overall biomechanics.

Many patients experience improved mobility and decreased muscle tension following adjustments.

Soft Tissue Therapy

Tight muscles often play a significant role in Thoracic Outlet Syndrome. Chiropractors frequently use soft tissue techniques, to relax structures such as:

• Scalene muscles

• Upper trapezius

• Levator scapulae

• Surrounding shoulder musculature

Reducing muscle tension can create more space within the thoracic outlet and relieve pressure on the nerves.

Postural Correction

Poor posture is one of the biggest contributors to Thoracic Outlet Syndrome. Your chiropractor will evaluate your posture and teach strategies to reduce forward head posture and rounded shoulders.

Small changes throughout the day often make a significant difference, especially for individuals who spend hours working at a desk.

Corrective Exercises

Exercise is essential for long-term improvement. A treatment plan may include:

• Stretching tight chest and neck muscles

• Strengthening the upper back and shoulder stabilizers

• Improving scapular control

These exercises help prevent symptoms from returning after treatment.

When Should You Seek Medical Attention?

Although many cases of Thoracic Outlet Syndrome improve with conservative care, certain symptoms require prompt medical evaluation.

Seek immediate medical attention if you experience:

• Sudden swelling of the arm

• Significant color changes in the hand

• A cold or pale arm

• Severe weakness

• Loss of pulse

• Increasing symptoms following traumatic injury

  
  

These may indicate vascular involvement that requires urgent medical management.

Can Thoracic Outlet Syndrome Be Prevented?

While not every case is preventable, maintaining good posture, staying physically active, strengthening the muscles around the shoulder blades, and taking regular breaks from prolonged sitting can significantly reduce your risk.

Athletes and individuals with physically demanding jobs should also focus on proper movement mechanics and recovery to avoid repetitive strain.

The Bottom Line

Thoracic Outlet Syndrome can be frustrating, especially when symptoms interfere with work, exercise, or everyday activities. Fortunately, many patients improve without surgery through conservative treatment that addresses the underlying cause of the compression.

At Washington Park Chiropractic, we perform a thorough evaluation to determine whether your symptoms are coming from Thoracic Outlet Syndrome or a similar condition. Using a combination of chiropractic adjustments, soft tissue therapy, and postural rehabilitation; our goal is to reduce nerve irritation, restore normal movement, and help you return to the activities you enjoy.

If you've been experiencing numbness, tingling, neck pain, or shoulder discomfort that just won't go away, don't ignore it. An accurate diagnosis and personalized treatment plan can make all the difference in getting you back to feeling your best.