Whether the bleeding of kidney cyst is serious or not needs to be determined according to the specific situation. A small amount of bleeding in simple kidney cyst is generally not serious, if the bleeding is from a huge cyst of the kidney, it may be more serious and needs to be treated actively. 1. Simple renal cyst: in this case with a small amount of bleeding, generally not serious, if the bleeding is relatively small, bleeding speed is not fast, you can use hemostatic drugs, such as Yunnan Baiyao. 2. Huge kidney cyst: If there is a huge kidney cyst, there is a longer period of continuous bleeding or a lot of bleeding, this situation is more serious. A large amount of bleeding in a short period of time may cause acute hemorrhagic anemia, a rapid drop in blood pressure, or even hemorrhagic shock, which needs to be given immediately to stop bleeding, and at the same time give blood transfusion treatment. When there is a kidney cyst bleeding, it is recommended to consult a doctor in time, under the guidance of the physician active treatment, so as not to delay the condition.