Thyroid cancer is the abnormal growth of cells of the thyroid gland to produce a tumor. Through a medical test can diagnose whether the gland has increased in size, and if there is a cancerous nodule or more. For the identification of cancer varied tests by puncture biopsy of thyroid nodules or ultrasound are usually carried as blood tests. Treatment depends on the extent of the tumor in each patient. In most cases you opt for surgical removal of nodules, but other treatments include the application of high-dose thyroid hormones or surgical removal of the nodules. In thyroid cancer symptoms can be mainly swelling or tumor in the neck, hoarseness and coughing, voice changes, difficulty swallowing, and so on.