Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Thoracic outlet syndrome ?
    ### Response:
    Thoracic outlet syndrome refers to the many signs and symptoms caused from compression of the group of nerves and blood vessels in the area just above the first rib and behind the clavicle. The term thoracic outlet syndrome is not a specific diagnosis, but refers to a group of conditions, namely neurogenic (nTOS), venous (vTOS), and arterial thoracic outlet syndrome (aTOS).
    