My Dad is 80 years old & has previously gone through Prostrate surgery. Since last 2 weeks he is passing blood /blood clots through Urine. Was admitted to hospital and was fine but back home it's recurring. Homeopathic medicines helped for 2 days only. He has constipation problems. Now it's better but continues to pass blood/clots sometimes. Cystoscopy revealed clots on urinary bladder which was cleaned. CT Scan / USG haven't revealed anything. Please suggest something. Could these be symptoms of Bladder cancer?