Foamy urine for a month in a row may be chronic cystitis, chronic urethritis, prostatitis and other diseases. 1. Chronic cystitis: cystitis is an inflammatory lesion of the bladder caused by bacterial infection and other non-bacterial infections and other factors, commonly bacterial infection. When bacterial infection occurs, the amount of red blood cells and white blood cells in the urine increases, which changes the composition of the urine and causes a lot of foam. 2. Chronic urethritis: Urethritis is divided into gonococcal urethritis and non-gonococcal urethritis, gonococcal urethritis is mainly infected with gonococcus bacteria, non-gonococcal urethritis may be related to Chlamydia trachomatis, Mycoplasma genitalium and Mycoplasma urealyticum, etc. The above bacteria will cause frequent urination, urgency and painful urination, and in addition there will also be some pus secretion, which will also be foamy when urinating. 3. Prostatitis: chronic infection of the prostate area, such as gas-producing bacteria infection, the gas content in the urine will increase, and foamy urine will appear. Foamy urine for a month in a row is considered abnormal, you should go to the hospital for examination, to clarify the cause of the symptomatic treatment.