Any of several syndromes in which blood vessels or nerves are compressed, usually by an overlying muscle, as they pass from the neck region to the arm, causing pain, numbness, and weakness of the arm and hand.胸廓出口症候群，胸部出口症候群：各种因为从颈部到手臂部分的血管或神经受到上方肌肉压迫而引起手臂及手部疼痛、麻痹及无力的症候群