Motivational Interviewing in Thoracic Outlet Syndrome

The goal of this clinical trial is to learn if motivational interviewing (MI) works to improve symptoms in people with thoracic outlet syndrome (TOS). TOS is a condition that causes long-term pain, numbness, and weakness in the arm and shoulder area. The main questions it aims to answer are: * Does MI lower pain and improve arm function in people with TOS? * Does psychological resilience predict treatment outcomes in people with TOS? Researchers will compare participants who receive MI sessions plus a home exercise program to those who receive a home exercise program alone. Participants will be randomly assigned to one of the two groups. Participants will: * Follow a home exercise program for 6 weeks * Some participants will also attend up to 4 motivational interviewing sessions * Complete questionnaires about pain, function, sleep, anxiety, and depression at the start and end of the 6-week program