What happens if thoracic outlet syndrome is not treated?

Thoracic outlet syndrome involves pressure on nerves or blood vessels passing between the neck, shoulder and upper chest. Persistent pressure may cause arm numbness and tingling, aching, heaviness or hand weakness. A vascular form can cause colour or temperature changes, swelling or reduced circulation. Symptoms may be position-related, such as when the arm is raised or the shoulders are held forward. Because the nerve and blood-vessel patterns differ, an examination matters before choosing treatment.

Arrange an evaluation if symptoms recur, interfere with work or sleep, or are gradually becoming more frequent. Keep a note of positions that trigger symptoms and whether colour, temperature or swelling changes occur. [Physiotherapy](/treatments/physiotherapy-and-rehabilitation/physiotherapy/) may address shoulder movement, breathing mechanics and muscle control. [Postural Correction Therapy](/treatments/physiotherapy-and-rehabilitation/postural-correction-therapy/) may help reduce sustained shoulder and neck loading. More about the condition is available under [Thoracic Outlet Syndrome](/conditions/thoracic-outlet-syndrome/).

Seek urgent medical care for sudden arm swelling, marked colour change, a cold hand, severe pain, new or worsening weakness, chest pain or breathlessness. These signs can indicate a circulation or nerve problem that should not wait for routine rehabilitation. For less urgent symptoms, book an assessment when numbness or tingling keeps returning or hand function is changing.

Ask whether your pattern suggests nerve, arterial or venous involvement, what tests may clarify it, which activities to modify, and what changes require urgent help. Ask how progress will be monitored during rehabilitation.