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 can also be caused temporarily by certain infections that attack the thyroid, causing a transient increase in thyroid hormone being released. One of the effects of excess thyroid hormone is that it causes the heart to beat faster. As the heart beats faster, more blood is pushed through the arteries.