Human body is very unique. Every organ, ever gland plays its own important role. And when there is any bad thing happen to any particular part or organ of the body, it does not only affect that place but also effect the whole body because all parts of the body are interlinked. Likewise glands are important organs of the body. They release special kind of substance which helps the body to function properly. In these gland, one of the most important gland is thyroid gland which is placed on the front of your neck. It secretes special kind of thyroid hormones which improve the working of your metabolism and as a result many functions of your body are done properly. When Thyroid gland starts abnormal production of thyroid it leads to many health issue. When it releases thyroid more than body need, this over activation of thyroid is called hyperthyroidism. And if the condition is obverse then it is called hypothyroidism.