The job duties of a behavioral health RN revolve around providing patient care in a mental health capacity. You work with psychologists, psychiatrists, and physicians to offer psychiatric and behavioral care. As a behavioral health nurse, you perform duties such as helping patients perform exercises to change thought patterns or habits. You may also assist with relaxation techniques for stress management or pain management. With specialized training, you may also employ biofeedback techniques or work with clients on long-term therapies such as personality development and behavior modification.