In approximately 95% of patients with Thoracic Outlet Syndrome (TOS), neurological structures are affected, while in about 5%, vascular (blood vessel) structures are involved. The symptoms experienced by the patient are directly related to the compressed structure. Arterial compression may manifest as coldness, numbness, and fatigue in the arm. Venous compression can lead to symptoms such as edema (swelling) and bruising (discoloration) in the arm. Nerve compression (Neurogenic TOS), on the other hand, typically presents with more pronounced complaints such as numbness, tingling, and pain in the arm. Additionally, neck and shoulder pain may occur. An increase in pain can be observed with activities like raising the arm, reaching, and carrying heavy objects.