The thyroid is a butterfly-shaped endocrine gland in your neck, just above your collarbone. The thyroid makes hormones to help control the rate of many activities in your body, including how fast you burn calories and how fast your heart beats. But, sometimes, problems develop with the thyroid gland, and it doesn’t secrete the right level of hormones. January is Thyroid Disease Awareness Month. On the next Mayo Clinic Radio program, endocrinologist Dr. John C. Morris III will discuss diagnosis and treatment of thyroid conditions, such as hypothyroidism, hyperthyroidism, Graves' disease and thyroid cancer. Also on the program, ophthalmologist Dr. Arthur Sit will explain the importance of regular eye exams to prevent glaucoma. And high-risk pregnancy certified nurse practitioner Deb Miller will share steps women can take to help prevent birth defects.