Advanced Prostate Cancer in an elderly person can cause frequent urination because the enlarged prostate or cancer may press on the urinary passage and irritate the bladder. Weak bladder control, incomplete emptying, urine infection, medicines, or reduced mobility may also increase urinary frequency, especially at night. Treatment usually focuses on improving comfort, reducing urinary difficulties and preserving quality of life. Depending on his condition, doctors may use medicines to relax the urinary passage, reduce prostate-related symptoms, control pain or manage bladder irritation. Limiting excessive fluids late at night, avoiding caffeine and helping him safely reach the toilet may also reduce discomfort. Routine monitoring for urinary infection, dehydration or urinary retention is important in elderly patients with advanced illness. Seek medical attention immediately if he develops an inability to pass urine, severe lower abdominal pain, fever, blood in urine, confusion, or sudden worsening weakness, because these symptoms may require urgent treatment and adjunctive care.