Participants in the intervention group will receive a U-shaped travel neck pillow immediately after surgery upon arrival to the ward. The pillow will be used only during rest (supine or semi-Fowler's position) for the first 24 hours postoperatively and removed before mobilization begins. After removal, assessments will include cervical comfort using the Visual Analog Scale (VAS), pain scores during neck movements (flexion, rotation, lateral flexion-excluding extension) via VAS, the McGill Pain Questionnaire for pain localization and severity, and cervical range of motion using a universal goniometer. This intervention aims to evaluate the pillow's effectiveness in reducing neck pain, stiffness, and discomfort, and improving mobility after thyroidectomy.

Participants in the control group will receive standard postoperative care following total thyroidectomy, without the use of a neck pillow. No additional non-pharmacological interventions will be provided. Pain management, mobilization, and other postoperative procedures will follow the hospital's routine clinical protocol. At 24 hours postoperatively, participants will be assessed for cervical comfort using the Visual Analog Scale (VAS), neck pain during movements (excluding extension) using VAS, pain localization and severity via the McGill Pain Questionnaire, and cervical range of motion using a universal goniometer. This group serves as a comparison to evaluate the effectiveness of the neck pillow intervention.

Participants in the intervention group will receive a U-shaped travel neck pillow immediately after surgery upon arrival to the ward. The pillow will be used only during rest (supine or semi-Fowler's position) for the first 24 hours postoperatively and removed before mobilization begins. After removal, assessments will include cervical comfort using the Visual Analog Scale (VAS), pain scores during neck movements (flexion, rotation, lateral flexion-excluding extension) via VAS, the McGill Pain Questionnaire for pain localization and severity, and cervical range of motion using a universal goniometer. This intervention aims to evaluate the pillow's effectiveness in reducing neck pain, stiffness, and discomfort, and improving mobility after thyroidectomy.

The Visual Analog Scale (VAS) is used to measure patient comfort. It is a 10 cm (100 mm) long line that can be oriented either horizontally or vertically. On this scale, 0 indicates "extremely uncomfortable" and 100 indicates "completely comfortable." In this study, the 10 cm VAS will be used in a horizontal orientation.

The Visual Analog Scale (VAS) is a 10 cm line, drawn either horizontally or vertically, with one end labeled "no pain" and the other end labeled "worst imaginable pain." Participants are asked to mark the point on the line that best represents their level of pain. In this study, the horizontal format will be used, as it has been reported to be more reliable.