Patients who experience dizziness, chills and vomiting after having blood drawn are considered to have a blood sickness reaction, which is the same as the patient’s needle sickness reaction. When the patient sees the blood flowing out, he or she will be more fearful inside and will experience palpitations, dizziness, pallor, cold sweat, weakness of the limbs, and in severe cases, it may lead to a brief loss of consciousness, which is related to the patient’s mental and psychological effects. Because the mental and psychological effects can lead to a sudden and severe dilatation of small veins and capillaries throughout the body, a large amount of blood can stagnate in the small vessels, resulting in a decrease in effective circulating blood volume, and the patient may experience dizziness, vomiting, and a drop in blood pressure. Especially when the patient is standing, the human head is in the highest position and the blood flow in the head will be downward, so the patient with insufficient blood supply to the brain tissue will have the symptoms of dizziness, and care should be taken to avoid the patient from falling and causing injury. To immediately let the patient lie down, drink sugar saline, rest for a while the patient’s symptoms can be relieved on their own.