Blood syncope is caused by cold stagnation and blood stasis. Typhoid fever has cold hands and feet, and thin pulse. For example, Danggui Sini Decoction is used. This syndrome is only cold hands and feet, and thin pulse. It is different from the cold syncope of Sini Decoction, which is caused by weak yang and strong yin, and the heat syncope of Baihu Decoction, which is caused by deep heat and deep syncope. It belongs to the syndrome of blood deficiency and cold stagnation. The key point of syndrome differentiation is that the thin pulse is caused by blood deficiency. Due to blood deficiency and cold stagnation, the pulse cannot nourish the pulse, and the limbs lose the warmth of blood, so the hands and feet are cold. Common clinical frostbite, gangrene, and dysmenorrhea belong to the scope of this syndrome. Practice has proved that all patients with this kind of disease are usually blood deficient, and are affected by external cold evil. The qi and blood are blocked by the cold evil, and the blood circulation is not smooth, so they suffer from this disease.