Erythromelalgia is a peripheral vasodilatory disease characterized by increased skin temperature, flushing, and severe burning pain, with coldness and fear of heat as one of the most distinctive features of the affected limbs. Some patients have no obvious reason for the disease, which is called primary; some patients have it on the basis of other diseases, such as erythrocytosis, thrombocytosis, peripheral neuritis, multiple sclerosis, systemic lupus erythematosus, hypertension, diabetes mellitus and rheumatoid arthritis, which is called secondary. The lesions are mostly bilateral and can occur in both sexes but are more common in women. Most cases develop in the winter or winter-spring season. Most cases occur in the hands and feet, with both feet being the most common. Most patients have a critical temperature for the onset of the attack, beyond which symptoms appear, and the general painful onset temperature is 30 to 36 degrees. The pain can be reduced or relieved by exposing the feet to quilts or by soaking them in cold water. Some patients I have treated can walk barefoot in the snow in winter, some patients sleep with their feet out of the window in winter, and some patients have family members carrying a bucket of cold water when they visit the hospital, ready to soak their feet in cold water. The initial onset of this disease is a functional vascular disease, mainly due to the dilatation of the terminal arteries. It can be said that this is one of the easiest diseases to treat among peripheral vascular diseases, and herbal treatment has very good effect. Most of the cases we treated were cured within a week without any sequelae. It is very unfortunate that this disease is still a rare disease, and many doctors do not know much about this disease and have even less experience in treating it, so early treatment is not timely and effective. Patients due to long-term immersion in cold water, resulting in local impregnation, the formation of ulcers, more due to the cold stimulation of vascular endings contraction, and even the formation of thrombosis and ischemic necrosis. Therefore, patients should go to a peripheral vascular specialist for timely treatment in this case.