Treatment by Condition Related to phentermine. Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, expect as may be authorized by the applicable terms of use. CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals.
Many diseases and conditions can cause hyperthyroidism, including: 1  Graves disease (most common cause of hyperthyroidism)  Inflammation (thyroiditis) of the thyroid due to viral infections, some medicines, or after pregnancy (common)
Hyperthyroidism is caused by an overactive thyroid, which means the thyroid produces too much hormone. This can cause rapid heart rate, high blood pressure, and unexpected or sudden weight loss. Hypothyroidism is caused by an underactive thyroid, which means the thyroid doesnât produce enough hormones.