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.
Gravesâ disease is genetic and tends to run in families â however, stress, smoking, and certain medications and viruses may set it off. Other causes of overactive thyroid include the development of thyroid nodules, inflammation of the thyroid following a virus or during pregnancy, and excessive iodine intake. Key sources of iodine in the diet are seafood, milk, bread and salt.