Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek urgent care for an inability to urinate, increasing lower abdominal pain, fever with urinary symptoms, or vomiting that prevents fluid intake.
Heavy bleeding, large blood clots, severe weakness, or confusion also needs prompt assessment.
Follow-up is used to check whether symptoms and bladder emptying are improving.
It may include a symptom review, urine flow testing, post-void residual measurement, urine testing, or kidney function tests.
After a procedure, follow-up may also check for infection, bleeding, recurrent narrowing, and changes in urinary control or sexual function.
Arrange routine follow-up if symptoms gradually worsen, urinary infections recur, or treatment side effects affect daily life.
Report new blood in the urine, even if it is painless, so the cause can be evaluated.
Keeping follow-up appointments helps determine whether further testing or a change in treatment is needed.
The article also says
After treatment, urinary symptoms may not disappear completely.
The bladder may need time to recover, or a separate bladder problem may be present.
Every sign above is quoted from the sofidex article on Bladder outlet obstruction. If you are not sure, err upward — it is always reasonable to be checked.