Thoracic Outlet Syndrome After a Car Accident: Diagnosis, Causation and Settlement Value

A thoracic outlet syndrome claim after a car accident is valued on the strength of the diagnosis, the proof that the crash caused or worsened it, and the treatment it required, which can include rib surgery. No average settlement applies, and the deadline to sue is generally two years in California (Code of Civil Procedure section 335.1) and Texas, and three years in Washington.

What is thoracic outlet syndrome?

Thoracic outlet syndrome, or TOS, happens when the nerves or blood vessels just below the neck are squeezed. According to the National Institute of Neurological Disorders and Stroke summary on MedlinePlus, the squeeze can happen between the neck and shoulder muscles or between the first rib and the collarbone. People feel burning, tingling and numbness along the arm, hand and fingers. A compressed nerve can weaken the hand; a compressed vein can make the hand pale, bluish or sensitive to cold, and the arm may swell.

The same source lists injury among the causes, along with anatomical defects, poor posture, pregnancy and repetitive arm movements. The MedlinePlus encyclopedia adds that people with TOS have often injured the area in the past.

This is general information from official health sources, not medical advice. Only your doctor can diagnose TOS.

Why does TOS take so long to diagnose after a crash?

TOS symptoms overlap with other problems. Car accidents commonly cause neck injuries such as whiplash (MedlinePlus), and arm tingling after a crash is often blamed on the neck first. MedlinePlus explains that doctors run tests to rule out other causes, such as carpal tunnel syndrome or nerve damage from neck problems.

Those tests often include electromyography, which checks the muscles and the nerves that control them, and a nerve conduction velocity study, which measures how fast signals move through a nerve. Imaging may follow. Months can pass between the crash and the diagnosis, and that gap is exactly where the insurer focuses.

Why do insurers fight thoracic outlet syndrome claims?

Because TOS has several possible causes, the adjuster will look for one that is not the crash. Common arguments are:

• an extra rib or a tight fiber band you were born with;
• poor posture or repetitive work with your arms overhead;
• a gap between the crash and the first complaint of arm symptoms;
• treatment for neck pain only, with no arm complaints written down.

California law gives you answers. You cannot recover for a condition you already had, but you can recover for how the crash made it worse (CACI No. 3927). And a defendant must pay the full harm even if you were more susceptible to injury than a typical person (CACI No. 3928). An extra rib that never bothered you before the crash does not end the claim.

The defense will likely ask for a defense medical exam. If you do not agree to one, Texas allows it only on a court order for good cause when your condition is in controversy (Rule 204). Washington’s Civil Rule 35 sets a similar standard and lets you bring an observer and audio record the exam unless the court orders otherwise.

What affects the value of a TOS settlement?

These points move a thoracic outlet syndrome claim more than any published figure:

• The treatment path. MedlinePlus says physical therapy is often used. A blood thinner may be given if a vein is compressed. If therapy and activity changes do not help, surgery may remove a section of the first rib, and some people have symptoms that return after surgery.
• Future care. California juries award the reasonable cost of care you are reasonably certain to need (CACI No. 3903A). A surgeon’s written opinion is the usual proof.
• Work. TOS can limit lifting and overhead work. Lost wages and a reduced ability to earn both count.
• Bills as paid. Texas limits medical expenses to the amount actually paid or incurred (section 41.0105).
• Fault. Texas bars recovery above 50 percent fault (section 33.001); Washington only reduces it (RCW 4.22.005).

Example only: a driver reports arm tingling at the emergency room, is diagnosed with TOS four months later after nerve testing, and has first rib surgery. Another driver first mentions arm symptoms a year after the crash, with no testing. The first file connects the dots; the second invites a causation fight. The facts of each case decide the outcome.

Is there enough insurance for a surgical TOS claim?

Often not from the other driver alone. The California minimum is $30,000 per person (DMV). Your own underinsured motorist coverage may add to it: Texas insurers must provide it unless you reject it in writing (Insurance Code 1952.101), and in Washington it generally matches your liability limits unless rejected in writing (RCW 48.22.030). If Medicare paid for treatment, it is repaid through its recovery process before your share is final.

What to do now

1. Tell every doctor about arm, hand or finger symptoms, even if your neck hurts more. Ask that it be written in the chart.
2. Keep a short symptom diary: when the tingling happens, what triggers it, what you cannot do.
3. Ask your doctor whether nerve testing is appropriate. Do not decide on your own.
4. Collect records from before the crash showing you had no arm complaints.
5. Mark your deadline: two years in California and Texas (section 16.003), three in Washington (RCW 4.16.080). See the California Courts guide. A late diagnosis does not reliably stop that clock.
6. Do not give a recorded statement about your arm symptoms before you understand the diagnosis.

Talk to us about thoracic outlet syndrome

If you have arm numbness or tingling since a crash and the insurer doubts the diagnosis, call Beverly Law at (310) 552-6959. We handle car accident cases in California, Texas and Washington. Texas cases are handled by the firm’s Texas-licensed attorneys, Joyce Ondich and John Efstathiou. You owe no fees or costs unless we win.

Common questions

Related pages

Car Accident Settlements · Car accident settlements · Why is my car accident settlement taking so long? · Law Blog

Important: This page is general information, not legal advice, and reading it does not create an attorney-client relationship with Beverly Law. Laws change and every case is different; talk to a lawyer about your own situation. Attorney advertising. Prior results do not guarantee a similar outcome. You owe no fees or costs unless we win. Texas cases are handled by the firm’s Texas-licensed attorneys, Joyce Ondich and John Efstathiou. Last reviewed: 2026-11-12.