Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Thyroid Diseases ?
    ### Response:
    Your thyroid is a butterfly-shaped gland in your neck, just above your collarbone. It is one of your endocrine glands, which make hormones. Thyroid hormones control the rate of many activities in your body. These include how fast you burn calories and how fast your heart beats.
    