Hyperthyroidism is when your thyroid produces too much thyroid hormone. The most common cause is an autoimmune condition called Graves’ disease. In Graves’ disease, your immune system attacks your thyroid gland causing it to make too much thyroid hormone. Other causes of hyperthyroidism include thyroid nodules, or thyroiditis (inflammation of the thyroid gland caused by a virus or pregnancy).

Common symptoms of hyperthyroidism include fatigue, tremors, rapid heartbeat, anxiety, muscle weakness, feeling more hot than other people, and eye changes. These symptoms can be non-specific, so it is important to see your doctor to have proper testing done.

Hypothyroidism is when your thyroid does not produce enough thyroid hormone for your body. It is the most common thyroid condition. The most common cause is an autoimmune condition called Hashimoto’s disease. In Hashimoto’s disease your immune system attacks your thyroid gland and it is not able to make enough thyroid hormone. Other causes of hypothyroidism include prior treatment with radioactive iodine, thyroid surgery, or a thyroid gland that has not formed properly.

Common symptoms of hypothyroidism include fatigue, constipation, depression, weight gain, and feeling more cold than other people. These symptoms can be non-specific, so it is important to see your doctor to have proper testing done.

A thyroid nodule is a growth of tissue or fluid filled cyst in the thyroid gland. Thyroid nodules are very common, and it is possible to have one and not know it is there. Most people do not have any symptoms and nodules are often found during a routine physician exam. If the nodule is large enough you may notice some pain, or difficulty swallowing. If you have a thyroid nodule your doctor will order tests to see how large it is and if it is making extra thyroid hormone.