The thyroid gland is a small organ that’s located in the front of the neck, wrapped around the windpipe (trachea). It’s shaped like a butterfly, smaller in the middle with two wide wings that extend around the side of the throat.
The thyroid is a gland. We have glands throughout our body, where they create and release substances that help the body do a specific thing. The thyroid makes hormones that help control many vital functions of the body.

A disease is a particular abnormal, pathological condition that affects part or all of an organism. It is often construed as a medical condition associated with specific symptoms and signs. It may be caused by factors originally from an external source, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune diseases. In humans, "disease" is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person afflicted, or similar problems for those in contact with the person.