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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. All of these activities are your body's metabolism.
If your thyroid gland is not active enough, it is called hypothyroidism. It can make you gain weight, feel fatigued, and have difficulty dealing with cold temperatures.(Read more)