Thoracic Outlet Syndrome in Midtown Manhattan: What Is Causing That Arm Numbness

Dr. Gary Yen, DC • September 8, 2026

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Thoracic Outlet Syndrome in Midtown Manhattan: What Is Causing That Arm Numbness?

If you work at a desk in Midtown Manhattan and have started noticing numbness, tingling, or aching that travels from your neck or shoulder down into your arm and fingers, you are not alone. Many New Yorkers assume these symptoms mean carpal tunnel syndrome or a pinched nerve in the neck. But there is another common culprit that often goes overlooked: thoracic outlet syndrome, or TOS.

At Manhattan Spine Rehab, our team of clinicians includes practitioners who are experts in evaluating and treating nerve-related conditions like TOS. Understanding what this condition is, why it develops, and how it is treated can help you take the first step toward relief.

What Is Thoracic Outlet Syndrome?

The thoracic outlet is the narrow space between your collarbone and your first rib. Several important structures pass through this space, including the brachial plexus (the bundle of nerves that supplies your arm and hand) and the subclavian artery and vein. When these structures become compressed or irritated, the result is thoracic outlet syndrome.

TOS is generally divided into two main categories:

Neurogenic TOS

This is by far the most common form, accounting for the vast majority of cases. It occurs when the brachial plexus nerves are compressed. Symptoms typically include numbness, tingling, or weakness in the arm and hand, often worse with overhead activity or prolonged desk work.

Vascular TOS

This less common form involves compression of the subclavian artery or vein. Signs can include arm swelling, a feeling of heaviness, coldness, color changes in the hand, or visible vein prominence. Vascular TOS warrants prompt medical evaluation because of the potential for blood clots.

Why Do So Many Desk Workers Develop TOS?

Life in Midtown Manhattan often means long hours at a computer, commuting with bags slung over one shoulder, and stress carried in the neck and shoulders. These habits create the perfect conditions for TOS to develop. Common contributing factors include:

• Forward head posture: Hours spent looking at screens shift the head forward, which increases tension in the scalene muscles of the neck and narrows the thoracic outlet.
• Rounded shoulders: Slouched positioning drops the shoulders forward and down, reducing the space between the collarbone and first rib.
• Repetitive arm use: Typing, mouse work, phone use, and carrying heavy bags all load the same tissues repeatedly throughout the day.
• Stress-related muscle tension: Elevated, shallow breathing and chronic tightness in the neck and chest muscles can further compress the outlet.
• Previous injury: Whiplash, falls, or shoulder injuries can alter the mechanics of the neck and shoulder girdle, setting the stage for symptoms months or even years later.

Common Symptoms of TOS

Because TOS symptoms can mimic other conditions, it is frequently misdiagnosed. Signs to watch for include:

• Numbness or tingling that travels into the arm, hand, and fingers, often involving the ring and pinky fingers
• Aching pain in the neck, shoulder, or upper back
• Symptoms that worsen with overhead reaching, carrying bags, or prolonged desk work
• A feeling of heaviness or fatigue in the arm
• Grip weakness or clumsiness with fine motor tasks
• Symptoms that ease when you change position or rest the arm

How Is Thoracic Outlet Syndrome Assessed?

An accurate diagnosis starts with a thorough history and physical examination. At Manhattan Spine Rehab, our clinicians focus on identifying exactly where and why compression is occurring. Assessment typically includes:

• Postural analysis of the head, neck, shoulders, and rib cage
• Range of motion and strength testing of the neck and shoulder
• Neural tension testing to evaluate how the nerves of the arm respond to movement
• Provocative maneuvers, such as the Roos test or Adson test, that stress the thoracic outlet
• Palpation of the scalenes, pectoralis minor, and surrounding soft tissues
• Screening to rule out cervical radiculopathy, carpal tunnel syndrome, and other mimicking conditions

In some cases, imaging or nerve studies may be recommended to clarify the diagnosis or rule out other causes.

A Conservative Care Approach to TOS

The good news is that most cases of neurogenic TOS respond well to conservative, non-surgical care. Our practitioners focus on addressing the root mechanical causes rather than simply masking symptoms. A typical treatment plan may include:

Nerve Mobility Work

Gentle nerve gliding and flossing techniques help the brachial plexus move more freely through the thoracic outlet, reducing irritation and improving tolerance to daily activities.

Postural Correction

Restoring a more neutral head, neck, and shoulder position opens the thoracic outlet. This often involves strengthening the deep neck flexors, mid-back muscles, and scapular stabilizers, along with ergonomic coaching for your workstation.

Soft-Tissue Treatment

Hands-on work targeting the scalenes, pectoralis minor, upper trapezius, and other tight structures can reduce compression and improve tissue mobility.

Breathing Retraining

Shifting from shallow chest breathing to diaphragmatic breathing decreases overuse of the accessory neck muscles that contribute to outlet compression.

When Is a Referral Needed?

While conservative care is the first line for most patients, certain situations call for medical referral. These include signs of vascular involvement such as arm swelling, color changes, coldness, or prominent veins, as well as progressive muscle wasting, severe unrelenting pain, or symptoms that fail to improve with a well-designed rehabilitation program. Our team works collaboratively with physicians and surgeons throughout New York City to make sure you get the right care at the right time.

Frequently Asked Questions

1. How do I know if my arm numbness is TOS or carpal tunnel syndrome?

Carpal tunnel syndrome typically causes numbness in the thumb, index, and middle fingers, often worse at night. TOS more often involves the ring and pinky fingers along with neck and shoulder pain, and symptoms tend to worsen with posture and arm position. A thorough evaluation can distinguish between the two, and some patients have both.

2. Can thoracic outlet syndrome go away without surgery?

Yes. The majority of neurogenic TOS cases improve significantly with conservative care that addresses posture, muscle tightness, and nerve mobility. Surgery is generally reserved for vascular TOS or cases that do not respond to rehabilitation.

3. How long does treatment for TOS take?

Every patient is different, but many people notice meaningful improvement within several weeks of consistent care. Long-standing symptoms or significant postural dysfunction may take longer. Your clinician will outline a realistic timeline after your initial evaluation.

Get Answers for Your Arm Numbness

You do not have to live with numbness, tingling, and nagging shoulder pain. The team at Manhattan Spine Rehab is here to help you find the cause and build a plan for lasting relief. Visit manhattanspinerehab.com or call our Midtown Manhattan office today to schedule your evaluation.