Usually patients with the following diseases need to perform hemodialysis: 1. Hemodialysis is a very important measure in renal replacement therapy, and most patients with renal failure need to do hemodialysis. Renal failure is divided into chronic renal failure and acute renal failure. Chronic renal failure is a gradual decrease in kidney function due to various reasons, and finally less than 10% of kidney function is left, developing to the uremic phase, and renal replacement therapy needs to be started. Patients with chronic renal failure need to do hemodialysis for a long time, and if they are eligible for kidney transplantation, they can stop hemodialysis after kidney transplantation. Acute renal failure refers to the sudden and drastic decline of kidney function due to various reasons, which may also require hemodialysis support treatment. Generally, more than 95% of acute renal failure can restore kidney function, and as long as the causative causes are removed, kidney function will usually gradually recover in about 3 weeks, and hemodialysis can be terminated after kidney function is restored; 2. Drug and poison poisoning, small drugs with relatively high molecular weight, such as sleeping pills Hemodialysis is needed after poisoning. Alcohol poisoning, you can use hemodialysis to get rid of alcohol in the body, alcohol molecular weight is very small, hemodialysis effect is very good; 3, other relatively rare cases need hemodialysis, such as severe heat stroke, the patient’s body temperature is very high can also use hemodialysis to bring down the body temperature. Severe frostbite patients with low body temperature can also raise their body temperature through hemodialysis; 4. Patients with liver failure can use hemodialysis to discharge small molecules of toxins to help recover liver function. In severe hemolysis, the toxins that cause hemolysis can be discharged through hemodialysis. The main cases that require hemodialysis are acute and chronic renal failure.