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 the most common cause of an overactive thyroid. Gravesâ disease is genetically linked, so a genetic predisposition to this disorder increases the risk factors for contracting this disease. Typically, women are more likely to develop Gravesâ disease than men.