Hemiplegic shoulder pain is a frequent complication after stroke and may be associated with structural abnormalities detectable by musculoskeletal ultrasound. This prospective cross-sectional observational study aims to evaluate the relationship between shoulder ultrasound abnormality score and pain severity in patients with post-stroke hemiplegic shoulder pain. Pain severity will be assessed using the Visual Analog Scale (VAS) for rest, movement, and night pain. Shoulder ultrasound will be performed using a standardized scoring system to quantify structural abnormalities. The primary objective is to investigate whether ultrasound abnormality burden is associated with pain severity in different clinical conditions (rest, exercise, and night).