Left-arm swelling compared with the other arm and pain with exertion can have several causes. If the swelling increases rapidly, the pain is severe, you cannot move the arm, you have new numbness or weakness in the arm or face, shortness of breath, chest pain, or any other alarming sign, go to the nearest emergency department immediately. For less urgent or stable symptoms, start with your primary care physician or internal medicine; they can refer you to a relevant specialist if needed (for example: Orthopedics and Traumatology; Physical Medicine and Rehabilitation; Neurology; Internal Medicine; Dermatology and Venereal Diseases; Infectious Diseases and Clinical Microbiology; or Emergency Medicine). When you visit a health facility, have these details ready: how long the swelling has been present and whether it started suddenly or gradually, any history of trauma, skin changes (redness or color change), accompanying numbness/tingling or weakness, severity of pain and what types of exertion increase it, and your general health and current medications. The clinician will take a focused history and perform a physical exam; depending on findings they may order blood tests, ultrasound/Doppler, X‑ray or advanced imaging (CT/MRI), and neurological testing. General home measures for low-risk situations include rest, avoiding heavy lifting, and monitoring symptoms; seek medical reassessment if symptoms worsen. This page provides general information and guidance and does not replace medical examination, diagnosis, or treatment.
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