There is no clinical term for arteriovenous fistula, which usually refers to an arteriovenous fistula. Arteriovenous fistulas are caused by abnormal capillary development and medical trauma. Clinically, arteriovenous fistula is divided into congenital arteriovenous fistula and acquired arteriovenous fistula. Congenital arteriovenous fistula is mainly due to abnormal capillary development, clinical more rare. Acquired arteriovenous fistula is mostly caused by medical trauma, such as percutaneous transluminal arteriography. The causes of acquired arteriovenous fistula also include puncture wounds, gunshot wounds and other penetrating injuries, and aneurysms breaking into the adjacent veins. In addition, some pregnant women are exposed to harmful substances for a long time, which can lead to fetal vascular development abnormality, thus triggering arteriovenous fistula, which should be taken seriously. It is recommended that patients with arteriovenous fistula further detailed examination, in order to clarify the cause of the disease, with the doctor to take symptomatic treatment measures, so as to improve the arteriovenous fistula caused by excessive sweating, hyperpigmentation, edema and other symptoms. Daily attention to rest, strengthen skin care, avoid foreign body friction stimulation.