Now – a – days, Thyroid has become one dangerous disease. Both men and women are affected in the same ratio, but the later has affected more when compare the ratio. Even the new born babies has affected with this disease. They are forced to take the treatment in their whole life time. The symptoms of this disease are that it is the butterfly shaped gland which will form at the neck portion not only in that but also in any parts of the body. But mostly the people will affect at the neck portion. The main causes are that the hormones segregation. There are two types of harm ones that are thyroxin and triiodothyroxine, which mainly affect the metabolism of our body at the type of segregation. Hypothyroidism will occurs due to under segregation and hyperthyroidism will occurs due to over segregation, but mostly people will affect with hypothyroidism. There will be symptoms like increase in heart beat, fever, rapid weight loss, excessive sweating, fatigue, dry skin etc. these symptoms will occur, only when the glands are not functioning properly. Some times this will result in thyroid cancer. Cancer will form mainly the enlargement of the lymph nodes. We can also able to find by blood test. Now a day’s ultra sound and radio iodine scanning has introduced. As the technology increases there are many different modes of treatment has introduced, such as medications, surgery – by medical replacement of the glands and radioactive ablation – mainly for the Graves’s diseases etc. one of the serious thing is that, even the new born babies are affected with this harmful diseases.