To treat neck tightness with physical therapy, start with gentle range-of-motion exercises like neck tilts, rotations, and side bends to improve flexibility. Incorporate stretching of the neck, upper back, and shoulder muscles to reduce tension. Strengthening exercises for the neck and upper back muscles help support posture and relieve strain. Apply heat before exercises to loosen tight muscles and ice afterward to reduce inflammation. Focus on maintaining proper posture throughout the day to prevent tightness recurrence.