Typically veins are generally wider than arteries, and therefore the pressure is lower. Capillaries are tiny vessels, so repsent high resistance to the incoming blood, so the rate of blood flow through will be quite low. All blood from the artery eventually passes through capillaries and into the vein.
Other causes of an overactive thyroid can include inflammation of the thyroid due to viruses or bacterial infections. Also, postpartum hyperthyroidism affects women immediately after pregnancy. This is one of the most common postpartum health disorders, and it affects between ten and twenty percent of women.
1 Treatment is not necessary unless the goiter is large and causes symptoms (there are often no symptoms). 2  Synthetic thyroid hormone is a treatment for underactive thyroid, while anti-thyroid drugs are options for an overactive gland.yperthyroidism is also a cause of goiter-from an overactive thyroid gland, which produces too much thyroid hormone. This usually happens as a result of Graves' disease, also an autoimmune disorder in which the body's immunity turns on itself and attacks the thyroid gland, causing it to swell. 3.