Hyperthyroidism Also called: overactive thyroid The overproduction of a hormone by the butterfly-shaped gland in the neck (thyroid). Hyperthyroidism is the production of too much thyroxine hormone. It can increase metabolism. When you first get hyperthyroidism, you may feel energetic. This is because your metabolism is sped up. But over time, this increase in your metabolism can break your body down and cause you to feel tired. Usually, hyperthyroidism develops slowly. Symptoms heart palpitations high blood pressure weight loss increased appetite irregular menstruation fatigue thinning hair increased sweating diarrhea trembling and shaking irritability sleep problems Hyperthyroidism can also lead to your thyroid gland swelling. This is called a goiter. Treatment consists of anti-thyroid medications Treatments include radioactive iodine, mediciation and sometimes surgery . Medications Antithyroid agent and Beta blocker A person with hyperthyroidism should avoid eating excessive amounts of iodine-rich foods, such as: iodized salt. fish and shellfish. seaweed or kelp. dairy products. iodine supplements. food products containing red dye. egg yolks. blackstrap molasses.