Overview of pyelonephritis and incentives

　　Pyelonephritis-induced factors are:
　　(1), poor urine flow: to encourage breeding Erzhi ascending infection of pathogens, such as polycystic kidney disease, kidney stones, kidney cancer, renal ptosis, ureter or lower urinary tract stones, tumors, pregnancy, neurogenic bladder, prostatic hyperplasia, urethral stricture Deng Jun easy to induce the disease.
　　(2) bladder - urinary reflux lose; mean voiding urine reflux from the bladder through the urethra to lose abnormal pelvis, such as the bladder and ureter bottom of the triangular muscle tone low, normal or inflammatory bladder over-filling can cause bladder - ureteral reflux, induced infection.
　　(3) low body resistance decreased: systemic diseases such as diabetes, may predispose to this disease.
　　4) urinary tract surgery or equipment operation; urinary tract surgery, such as urethral dilatation, cystoscopy, catheterization, especially indwelling catheter for more than four days, up to 90%.
　　(5) sex: sex as female urethra when pressure retraction, wound or urinary tract is too short, anterior urethral bacteria susceptible to infection by direct squeeze into the bladder Er Zhi.