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.
Hyperthyroidism is caused by an overactive thyroid, which means the thyroid produces too much hormone. This can cause rapid heart rate, high blood pressure, and unexpected or sudden weight loss. Hypothyroidism is caused by an underactive thyroid, which means the thyroid doesnât produce enough hormones.