Signs of Thoracic Outlet Syndrome

The thoracic outlet is the passage between the lower neck and upper chest. Nerves and blood vessels travel through it toward the arm. Pressure in this space can produce symptoms that spread from the neck or shoulder into the arm, forearm, or hand. Symptoms may worsen when the arm is held overhead, carried forward, or used repeatedly.

Nerve irritation often feels like pins and needles, reduced sensation, aching, or a tired grip. Blood-vessel involvement can make the hand feel unusually cold or look pale, bluish, or swollen. These signs can overlap with other neck, shoulder, or circulation problems, so an examination matters. Read more about [Thoracic Outlet Syndrome](/conditions/thoracic-outlet-syndrome/) and [Arm Numbness and Tingling](/symptoms/arm-numbness-and-tingling/).

Note which activities bring on symptoms, whether one or both arms are affected, and whether changing posture eases them. Avoid forcing painful overhead positions or carrying loads that reliably trigger tingling. A clinician may assess neck and shoulder movement, sensation, strength, pulses, and posture. Depending on the findings, [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) or [Postural Correction Therapy](/treatments/physiotherapy-and-rehabilitation/postural-correction-therapy/) may be considered.

Arrange an assessment if symptoms keep returning, grip becomes less reliable, or numbness interferes with sleep, work, or dressing. Seek urgent medical help for sudden arm swelling, marked colour change, severe coldness, new weakness, chest pain, or breathlessness. These features can signal a circulation or nerve problem needing prompt attention.

Ask whether your pattern fits nerve, venous, or arterial thoracic outlet involvement; which movements should be limited; and whether your neck, shoulder, or circulation also needs evaluation. Mention any hand numbness, since its distribution can help guide the examination.