Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
These concerns usually need timely review but are not always emergencies.
Seek urgent or emergency care for:
Heavy bleeding or large blood clots in the urine
Being unable to pass urine
Severe side pain with fever, chills, or vomiting
Fainting, marked weakness, confusion, or shortness of breath
Very little urine together with worsening pain or swelling
These symptoms can indicate significant bleeding, a blocked urinary tract, infection, or impaired kidney function.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Arrange a prompt medical appointment if you notice visible blood in your urine, even if it happens once or is painless.
Also seek assessment for continuing side pain, repeated urinary symptoms without a clear cause, unexplained weight loss, or unusual tiredness.
3
Does any of this apply?
Book an appointment
And for anyone, someone who:
has noticed a lump, a mole that has changed, or unexplained weight loss
The article also says
If you have been treated for this cancer, contact your cancer team about new bleeding, worsening urinary symptoms, persistent pain, treatment side effects, or difficulty following your monitoring plan.
Every sign above is quoted from the sofidex article on Renal pelvis or ureter cancer. If you are not sure, err upward — it is always reasonable to be checked.