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.
Abnormal function. When the thyroid gland produces too much thyroid hormone (becoming overactive), the condition is called hyperthyroidism. When the thyroid gland produces too little thyroid hormone (becoming underactive), the condition is called hypothyroidism.The most common cause of hyperthyroidism is an autoimmune condition called Graves' disease.bnormal function. When the thyroid gland produces too much thyroid hormone (becoming overactive), the condition is called hyperthyroidism. When the thyroid gland produces too little thyroid hormone (becoming underactive), the condition is called hypothyroidism.