The thyroid gland releases hormones that regulate metabolism, brain and bone growth, calcium levels, and body temperature. Dysfunctions of the thyroid can cause a variety of symptoms including hair loss, voice changes, fatigue, depression, inability to lose weight, heart problems, feeling cold, and frequent sleep. Both hypothyroidism and hyperthyroidism may be caused by autoimmune disorders, thyroid inflammation, or iodine deficiency. Homeopathy can effectively treat thyroid problems and their symptoms by regulating hormone production and metabolic rate.