Dr Gowri Singh is the Best Thyroid Doctor in Viman Nagar, Kalyani Nagar, Koregaon Park, Vishrantwadi, Kharadi, Wagholi and Pune. The thyroid is a butterfly-shaped gland in the front of the neck. It produces hormones that control the speed of your metabolism -- the system that helps the body use energy. Thyroid disorders can slow down or rev up metabolism by disrupting the production of thyroid hormones.