Embolic nephritis is one of the renal manifestations of renal damage in infective endocarditis, including cardiovascular interventional consultations and cardiac or non-cardiac procedures, intracardiac pressure monitoring intubation, atrioventricular shunts, high-energy nutrition, biopsies, pacemakers, arteriovenous intubation, catheters, tracheal intubation (especially in patients with burns, with reduced resistance). The bacteria that cause infective endocarditis or their products act as antigens and produce corresponding antibodies, both of which form a circulating immune complex. The site of deposition of the immune complex in the glomerulus is related to the type of bacteria and the period of infection, but depends mainly on the size and solubility of the antigen-antibody complex. Acute infective endocarditis is mostly caused by the invasion of intracardiac membranes by highly virulent bacteria. Staphylococcus aureus infection is the main cause of acute infective endocarditis and the main causative agent in patients with drug addiction and prosthetic valves. These patients often have systemic bacterial dissemination, including the skin, bones, joints, eyes, and brain. 5% to 10% of patients with drug-addicted and prosthetic valve infective endocarditis are caused by gram-negative bacteria. Infective endocarditis due to anaerobic bacterial infections accounts for approximately 1% of cases and may be due to the high oxygen content of intracardiac blood which is not conducive to the growth of anaerobic bacteria. The clinical manifestations depend on the size of the embolus as well as the site and degree of embolism. In small cases, the patient may not have any symptoms, only showing microscopic hematuria or proteinuria; in large cases, severe back pain may occur suddenly, similar to renal colic caused by kidney stones, and often appearing as meatus hematuria. You should go to the nephrology department of a regular hospital for examination, such as liver function, ultrasound monitoring of the affected area, and routine urine examination.