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.
Graves' disease. Graves' disease is the most common cause of overactive thyroid. It can run in families and can occur at any age, although it is most common in women aged 20-40 years old. You are more likely to develop Graves' disease if you smoke. Graves' disease is an autoimmune condition.
Introduction. Overactive thyroid (also known as hyperthyroidism) is a relatively common hormonal condition that occurs when there is too much thyroid hormone in the body. Excess levels of thyroid hormones can then speed up the bodyâs metabolism, triggering a range of symptoms, such as: 1  nervousness and anxiety. 2  hyperactivity â where a person canât stay still and is full of nervous energy. 3  unexplained or unplanned weight loss.