Differentiated thyroid cancer, in its advanced stages, can exhibit noticeable symptoms due to large nodules or invasion of surrounding organs. For example, a massive nodule pressing on the trachea can cause breathing difficulties, including respiratory distress. Compression of the esophagus can lead to swallowing difficulties, and pressure on the recurrent laryngeal nerve may result in symptoms like hoarseness. Even very few benign thyroid nodules can cause edema and inflammation by compressing these nerves. Therefore, differentiation and distinctive treatment are essential, along with a pathological diagnosis. Medullary thyroid cancer also presents specific symptoms, including persistent diarrhea, endocrine syndromes, and other accompanying conditions such as pheochromocytoma, multiple mucosal neuromas, and symptoms and signs caused by parathyroid adenomas.