Thyroid cancer is a type of cancer that originates in the thyroid gland, a small gland in the front of the neck. The most common symptom of thyroid cancer is a painless lump or swelling in the neck. Symptoms such as unexplained hoarseness, difficulty swallowing, or painless enlargement of the neck lymph nodes that last for more than a few weeks usually occur in more advanced disease. The prognosis of thyroid cancers is generally good when compared to other cancer types. Most thyroid cancer patients can be treated easily and effortlessly with hormone and radioactive Iodine-131-atom treatments.