<s>[INST] im 55ys old with daily sexual intercourse. i have experienced few drops of blood in my breif coming from urethra.it was painless and infrequent,just 3 times over 40 days. it is not related to intercourse and i have no urinary symptoms.my ultrasound study showed enlarged prostate (vol. 32ml.) [/INST] Good day, and thank you for being with Chat Doctor ! Blood in the urethra that is not related to sexual intercourse is worrisome for us urologist, and you need to have a complete urological workup. The reason for this is blood In the urine and in the genitourinary system is a red flag for us, we need to rule out cancer or malignancy. The more common condition that could because this would be infection and stones in the urinary system, but we have to rule out the most Chat Doctor.  You need to have an urinalysis, and a ct program (CT SCAN with IV contrast of the abdomen) to check where the blood is coming from. IF those two come out normal then a cystoscopy should be performed. Cystoscopy is inserting a scope in the bladder and looking inside to check the urethra, prostate and inside the bladder to rule out mass lesions inside and to determine where the blood is coming from.  I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://www.ChatDoctor .com/doctors/ </s>