Whether the appearance of spider nevus is serious or not is related to the cause of the disease, such as the appearance of spider nevus during puberty and pregnancy is not serious, and if it is caused by liver function abnormality such as cirrhosis and hepatitis, the pathology is more serious. 1. Physiological spider nevus: this disease is usually due to more estrogen secretion during puberty and pregnancy, which leads to the appearance of spider nevus, and it usually disappears with the growth of age and after giving birth. 2. Pathological spider nevus: if affected by liver cirrhosis, hepatitis and other diseases, liver function abnormality, liver inactivation of estrogen is weakened, thus inducing the appearance of spider nevus, which is relatively more serious. The causes of spider nevus are many and the severity is not the same, it is recommended to go to regular hospital for examination, according to the specific examination results, under the doctor’s diagnosis, carry out targeted treatment.