The name of the leaky intestine of piglets and boars is different according to the location of the leaky intestine. If the leaky intestine is located in the navel, it is called umbilical hernia. If it's called scrotal hernia in the posterior drive testis. \xd\ Umbilical hernia has two causes: \xd\1. Congenital cause: it is caused by incomplete umbilical foramen atresia during the growth and development of piglets in fetal period. Due to the high pressure of abdominal cavity, the contents of abdominal cavity emerge under the skin through umbilical foramen. \xd\2. Acquired cause: In the process of delivery, due to improper methods, the umbilical abscess was caused, which led to the damage of umbilical foramen and induced this disease. On the other hand, piglets sucking each other's umbilical cord, fighting, constipation, overeating, squeezing, and excessive screaming when catching can induce umbilical hernia. \xd\ Porcine scrotal hernia is also caused by intestinal tube escaping into the scrotum (tunica vaginalis) through inguinal orifice, and there are two reasons for the disease. \xd\1. Congenital abdominal sulcus orifice is too large, which is caused by the heredity of boars. \xd\2. Acquired, mainly caused by excessive abdominal pressure, which enlarges the inguinal canal, such as catching, climbing, jumping and anger.