Open Thyroid Surgery With Pillow Versus no Pillow for Better Post-operative Outcomes

Primary: To compare the post-operative pain in patients with neck extension and without neck extension. Secondary: To determine the benefit of neck exposure and peri-operative complications, which include duration of operation, intra-operative blood loss, recurrent nerve (RLN) injury and hypocalcaemia in both groups. Hypothesis: Patients who undergoing thyroidectomy without neck extension will have less post-operative pain and there are no significant difference of post-operation complications between both groups.