Sudden pain in the buttocks bleeding consider hemorrhoids, anal fissure and other diseases caused. If the work is not heavy physical labor, you can take the car to work, but it is recommended to seek timely medical treatment. 1. anal fissure: located in the lower edge of the dentate line ulcer, usually manifested as perianal severe pain accompanied by bleeding, constipation and other manifestations, the main treatment method surgical treatment, such as anal fissure excision. 2. Hemorrhoids: the most common perianal disease, divided into internal hemorrhoids, external hemorrhoids, mixed hemorrhoids. The main performance includes blood in the stool, perianal severe pain and so on. The main use of conservative treatment, such as improving diet, eat more food containing fiber, such as sorghum rice, etc., can also use hot water sitz bath. Surgery can also be used. Sudden pain in the buttocks and bleeding, there may be other causes, such as anal fistula, middle and advanced rectal cancer. Therefore, we should consult a doctor in time, after a clear diagnosis, follow the doctor’s instructions to receive timely treatment, so as not to delay the condition.