1. An underactive  frontal lobe causes a person to crave stimulation. 2. An underactive  thyroid, or hypothyroidism, can cause feelings of depression. 3. Underactive  thyroid, or hypothyroidism, which slows the metabolism.4. These may be an advantage as well for underactive  thyroid. 5. They included severe anemia, bleeding from the intestine and an underactive  thyroid gland. 6. One of several such medications, it is prescribed for patients with underactive  thyroid glands. 7. An underactive  thyroid-- hypothyroidism-- is by far the most common problem. 8. Either an underactive  thyroid or overproduction of thyroid hormone can also contribute to an erectile problem. 9. In addition to heart trouble, he had an underactive  thyroid, internal bleeding and severe anemia. 10. Yeltsin's medical problems included a severe anemia, bleeding from the intestine and an underactive  thyroid.