<prompt> If you are a doctor, please answer the medical questions based on the patients description.My urine has been very foamy and it looks like a plastic film if I let it stay in the toilet for a while like an oily substance. My GP told me my last blood test had a gfr of 51. Ive been also diagnosed with chronic prostititis as well. I take flomax and terazosin which helps me greatly to urinate. My prostate is always swollen. Could my prostitis be the cause of the urine change. Ive increased my water intake with no changes other than the color being clearer. kidneys hurting a little  <response>: Hi, Having prostatitis infection of the prostate is also associated with infection of the urinary tract including bladder and kidney. So, Id suggest to: - do a urinalysis- do abdominal ultrasound-do spermatic fluid testing and culture-do measure your blood sugar levels and perform lipid profile testing to exclude infection of urinary tract or kidney stones or other problems. Id advise to:- Chat Doctor. 