Common symptoms of thoracic outlet syndrome (thoracic outlet syndrome) include pain or numbness in the arm, muscle weakness or atrophy, swelling of the arm, and pale and cold hands. 1. Pain or numbness in the arm or shoulder and neck: This is the most common symptom of neurogenic thoracic outlet syndrome, which is felt as pain in the shoulder, neck and arm. 2. Muscle weakness or atrophy: Long-term compression of the brachial plexus nerve will cause muscle weakness and atrophy, and the arm will feel floppy and weak. 3. Swelling of the arm: venous compression leads to venous thrombosis and therefore swelling of the arm, like edema. 4. Pale and cold hands: arterial pressure leads to arterial thrombosis, which results in cold and pale hands. If the above symptoms occur, it is recommended to seek timely medical treatment to avoid nerve damage.