If the patient gets up dizzy after lying down for a while, there are usually the following factors: 1, abnormal blood pressure regulation, common factors for upright hypotension, because of arterial regulation of blood pressure level dysfunction, such as arteriosclerosis, age factors, will cause the above situation. 2, the patient has insufficient blood volume, such as heat stroke, high fever or acute gastroenteritis, resulting in nausea, vomiting, dehydration and other factors, causing insufficient blood volume after the patient have dizziness after lying down for a while and getting up. 3, adverse reactions caused by taking certain drugs, such as a large number of vasodilators, diuretics, antihypertensive drugs or antidepressants, weight loss drugs, have the above-mentioned adverse side effects. 4, for the weakened regulation of internal environmental homeostasis, for example, patients with long-term cardiac insufficiency, will have the above symptoms.