In most instances, the prognosis of well-differentiated thyroid carcinoma is generally favorable and adequately controlled by surgery alone. In some cases, however, in which the tumor has remained or in recurrent cases, infiltrates surrounding the skin or trachea can result in uncontrollable hemorrhage which cannot be treated with conventional medical or surgical therapy. We present our attempts at hemostatic procedures in such cases. When a thyroid cancer for which radical surgery is not indicated invades the skin with hemorrhage, we remove the ulcerated skin area with as much of underlying cancerous tissue as possible, and cover the defect skin area with a Bakamjian's deltopectoral flap or a musculocutaneous flap. In the 4 cases we have experienced, there had been no ulceration of the flap skin or recurrent. When a thyroid cancer invades the tracheal wall resulting in an intratracheal tumor accompanied by hemoptysis, we attempt to perform bronchoscopic cauterization using Nd-YAG Laser. Cauterization is repeatedly performed weekly, up to five times in one series. In all cases, radioiodine therapy is used before or after treatment. In all 4 cases we have experienced, hemostasis and shrinkage of the tumor was achieved. No complication such as ulcer formation or perforation was noted.